WEBVTT NOTE Machine transcript of the film's sound; not yet checked. 1 00:00:26.120 --> 00:00:32.080 A century ago, in 1858 to be exact, the company we now know as Johns-Manville 2 00:00:32.080 --> 00:00:36.960 was founded by H.W. Johns in a small basement room in lower New York. 3 00:00:37.560 --> 00:00:42.380 One of the first products turned out by Mr. Johns was an improved roofing felt. 4 00:00:42.660 --> 00:00:48.100 In fact, tradition has it that Mr. Johns helped remove the excess bitumen from the 5 00:00:48.100 --> 00:00:52.680 first batch of felt by running it through an old-fashioned clothes wringer, turning 6 00:00:52.680 --> 00:00:53.680 the handle himself. 7 00:00:53.620 --> 00:00:59.560 These early roofings, with their successors, have set a standard of quality which 8 00:00:59.560 --> 00:01:04.240 has won the approval of architects, building owners, and roofing contractors for 9 00:01:04.240 --> 00:01:06.040 generation after generation. 10 00:01:07.380 --> 00:01:12.920 Today, a hundred years later, Johns- Manville continues to manufacture quality 11 00:01:12.920 --> 00:01:18.080 roofings, but the small basement room has grown into huge manufacturing plants 12 00:01:18.080 --> 00:01:21.660 located strategically in the United States and Canada. 13 00:01:21.660 --> 00:01:26.680 One of its greatest contributions to the roofing industry has been the introduction 14 00:01:26.680 --> 00:01:32.610 of asbestos felts into roof construction. Today, from 15 00:01:32.610 --> 00:01:34.390 great mines located in Canada 16 00:01:34.390 --> 00:01:40.430 and other parts of the world, Johns- Manville mines and processes its own asbestos fiber. 17 00:01:41.250 --> 00:01:47.530 The employment of asbestos fiber instead of organic fibers in roofing felts gives many 18 00:01:47.530 --> 00:01:53.410 advantages asbestos is a mineral fiber which cannot rot decay 19 00:01:53.410 --> 00:01:56.450 or burn it is as 20 00:01:56.450 --> 00:02:02.350 permanent as stone ordinary roofing felts 21 00:02:02.350 --> 00:02:04.570 are made of organic fibers which 22 00:02:04.570 --> 00:02:09.190 are actually tiny hollow tubes filled and coated with bitumen 23 00:02:09.190 --> 00:02:11.150 on the other 24 00:02:11.150 --> 00:02:17.030 hand asbestos fibers are inorganic they are small solid 25 00:02:17.030 --> 00:02:19.030 rods which being solid 26 00:02:19.030 --> 00:02:24.630 are not filled with bitumen, but are coated only in the manufacturing process. 27 00:02:26.690 --> 00:02:32.110 With ordinary roofing felts, the organic tubular fibers act as wicks 28 00:02:32.250 --> 00:02:37.390 and allow the sun to draw off both the bituminous saturant in the felt 29 00:02:37.390 --> 00:02:41.470 and the cementing agent used between the plies of felt. 30 00:02:42.510 --> 00:02:47.690 This destructive oxidation process greatly shortens the life of the roof. 31 00:02:50.180 --> 00:02:54.200 Asbestos roofing felts guard against this damage through oxidation. 32 00:02:54.860 --> 00:02:57.280 Because asbestos fibers are 33 00:02:57.280 --> 00:03:03.440 solid, they cannot act as wicks through which the asphalt may be drawn off by the sun. 34 00:03:05.190 --> 00:03:06.330 They form a 35 00:03:06.330 --> 00:03:12.290 network in each ply which protects the impregnated bitumen within the felt and 36 00:03:12.290 --> 00:03:13.610 the layers of bitumen 37 00:03:13.610 --> 00:03:19.230 between the felts. When an asbestos felt roof 38 00:03:19.230 --> 00:03:21.890 bleaches in the sun, the action is 39 00:03:21.890 --> 00:03:27.930 only skin deep. Wherever you scrape the gray weathering of a smooth surfaced 40 00:03:27.930 --> 00:03:31.750 asbestos roof, you will find black asphalt underneath. 41 00:03:32.470 --> 00:03:34.030 This test can be 42 00:03:34.030 --> 00:03:38.150 repeated a dozen times in the same spot with the same results. 43 00:03:39.350 --> 00:03:40.490 Because of the 44 00:03:40.490 --> 00:03:46.090 protection of the bitumen by the asbestos fibers roofs built with asbestos felts 45 00:03:46.090 --> 00:03:47.290 do not require 46 00:03:47.290 --> 00:03:53.270 a protective slag or gravel surfacing smooth surfaced roofs offer many 47 00:03:53.270 --> 00:03:54.270 other advantages 48 00:03:55.390 --> 00:04:01.190 damage is easy to locate and repair thorough roof drainage is assured 49 00:04:01.190 --> 00:04:03.010 and the roof deck is 50 00:04:03.010 --> 00:04:08.760 not subjected to the excess weight of slag or gravel Johns- 51 00:04:08.760 --> 00:04:11.240 Manville has two basic asbestos 52 00:04:11.240 --> 00:04:17.280 roofing specifications. First, for decks with pitches from one-half inch and over, there 53 00:04:17.280 --> 00:04:22.240 is the well-known Flexstone built-up roof, which has been protecting commercial and industrial 54 00:04:22.240 --> 00:04:28.560 buildings for scores of years. Second is an asbestos roof specifically designed for slopes 55 00:04:28.560 --> 00:04:31.820 of less than one-half inch and for dead level decks. 56 00:04:32.120 --> 00:04:34.580 It is the Aquadam built-up roof. 57 00:04:35.920 --> 00:04:41.100 The Aquadam built-up roof is the result of a number of years of experimentation and 58 00:04:41.100 --> 00:04:46.960 testing in the laboratory and in the field. Before Aquadam was publicly 59 00:04:46.960 --> 00:04:48.160 announced, test 60 00:04:48.160 --> 00:04:53.720 installations were made on buildings all over the country and under varied climatic conditions. 61 00:04:54.520 --> 00:05:00.620 Today, after 10 to 20 years of actual field tests, they are in perfect condition. 62 00:05:02.440 --> 00:05:03.440 These 63 00:05:03.160 --> 00:05:09.060 asbestos roofs owe their superiority to Aquadam, the cementing agent which is 64 00:05:09.060 --> 00:05:10.060 used between 65 00:05:09.820 --> 00:05:15.320 the plies of felt and on the surface. Aquadam contains all the valuable 66 00:05:15.320 --> 00:05:19.840 qualities necessary for the construction of a superior dead-level built-up roof. 67 00:05:20.420 --> 00:05:24.600 Qualities not found combined in any other one bitumen. 68 00:05:26.080 --> 00:05:27.600 Let us take you to the 69 00:05:27.600 --> 00:05:32.040 largest research center in the world devoted to building materials and show 70 00:05:32.040 --> 00:05:36.940 you actual tests which prove that Aquadam possesses the qualities the 71 00:05:36.940 --> 00:05:42.060 architect or engineer considers most desirable for the construction of a superior 72 00:05:42.060 --> 00:05:43.060 built-up roof. 73 00:05:44.980 --> 00:05:49.570 The first quality demanded of a roof is that it must withstand the weather. 74 00:05:50.330 --> 00:05:54.110 Aquadam fully meets this qualification, as you will see. 75 00:05:56.000 --> 00:05:58.800 In this modern machine, accelerated 76 00:05:58.800 --> 00:06:04.520 weathering tests can be made. Films of Aquadam and other bitumens are 77 00:06:04.520 --> 00:06:06.480 exposed to ultraviolet light, 78 00:06:06.480 --> 00:06:12.040 water sprays, heat, cold, and thermal shocks under 79 00:06:12.040 --> 00:06:15.660 controlled conditions. After being subjected to 80 00:06:15.660 --> 00:06:21.620 those conditions for many cycles representing years of exposure, Aquadam showed 81 00:06:21.620 --> 00:06:23.020 less deterioration 82 00:06:23.020 --> 00:06:28.900 than other bitumens tested. Another important quality an architect 83 00:06:28.900 --> 00:06:30.520 or engineer might demand 84 00:06:30.520 --> 00:06:36.360 in a roofing bitumen is its ability to heal itself if for some reason cracks 85 00:06:36.360 --> 00:06:37.780 or imperfections have 86 00:06:37.780 --> 00:06:43.460 previously formed in the bitumen layer. This test is designed to measure the 87 00:06:43.460 --> 00:06:47.040 degree to which a bitumen will heal itself under sun temperatures. 88 00:06:48.380 --> 00:06:49.380 Films of 89 00:06:49.100 --> 00:06:54.060 Aquadam and other dead level asphalt are placed on aluminum panels and scribed 90 00:06:54.060 --> 00:07:00.700 with cracks. These panels are then placed in an oven heated to 135 degrees 91 00:07:00.700 --> 00:07:05.740 Fahrenheit. After a period of time the amounts of 92 00:07:05.740 --> 00:07:08.660 rehealing of the scribed lines is noted. 93 00:07:09.700 --> 00:07:12.460 Ordinary dead level asphalts, as you can see, 94 00:07:12.700 --> 00:07:16.300 show an almost complete absence of self- healing qualities. 95 00:07:18.620 --> 00:07:23.020 Aquadam, on the other hand, resealed itself 100%. 96 00:07:25.000 --> 00:07:27.340 The third quality demanded of a good bitumen 97 00:07:27.340 --> 00:07:29.920 is that it have a high degree of ductility. 98 00:07:30.820 --> 00:07:34.200 By ductility, we mean the ability of the bitumen film 99 00:07:34.200 --> 00:07:40.060 to be distorted without breaking. This distortion might be due either to expansion 100 00:07:40.060 --> 00:07:43.620 and contraction of the roof deck or to building movement. 101 00:07:45.020 --> 00:07:47.760 On this test machine, specifically 102 00:07:47.760 --> 00:07:54.140 designed to test the ductility of various bitumens, we see an ordinary dead level asphalt 103 00:07:54.140 --> 00:07:59.970 being tested. The break occurs when the bitumen 104 00:07:59.970 --> 00:08:02.070 is stretched from seven to eight centimeters. 105 00:08:03.370 --> 00:08:08.790 bitumens such as these would soon crack and break when subjected to sudden temperature 106 00:08:08.790 --> 00:08:14.750 changes or movement of the roof deck let us see what happens to Aquadam 107 00:08:14.750 --> 00:08:15.990 in the same test 108 00:08:15.990 --> 00:08:21.550 because Aquadam is truly ductile it can be stretched to the 109 00:08:21.550 --> 00:08:23.090 absolute limit of the machine 110 00:08:23.090 --> 00:08:29.070 without breaking here is the proof that this improved bitumen 111 00:08:29.070 --> 00:08:31.170 will most effectively resist 112 00:08:31.170 --> 00:08:34.730 distortion and breakage under actual service conditions. 113 00:08:35.270 --> 00:08:36.270 As 114 00:08:44.430 --> 00:08:45.870 everyone knows, the 115 00:08:45.870 --> 00:08:50.030 bitumen used in a built-up roof comes to the job in solid form. 116 00:08:50.450 --> 00:08:51.890 It must then be 117 00:08:51.890 --> 00:08:55.170 reduced to a viscous state before applying it on a roof. 118 00:08:55.870 --> 00:08:57.210 In many cases, 119 00:08:57.410 --> 00:09:02.290 through heating the bitumen in the kettle, many of the virtues built into it 120 00:09:02.290 --> 00:09:08.050 by the manufacturer are destroyed. Therefore, the bitumen that changes the 121 00:09:08.050 --> 00:09:12.650 least when heated will be the one to reach the roof in the nearest to its 122 00:09:12.650 --> 00:09:18.970 original and desired characteristics. This is the kettle stability test 123 00:09:18.970 --> 00:09:23.090 designed to measure the ability of a bitumen to retain its original 124 00:09:23.090 --> 00:09:27.950 composition under the normal and abnormal temperatures to which it may be 125 00:09:27.950 --> 00:09:33.400 subjected in the kettle. In this test the samples of various 126 00:09:33.400 --> 00:09:34.780 bitumens are first 127 00:09:34.780 --> 00:09:38.780 weighed in standard containers and placed on a shelf in the oven. 128 00:09:39.840 --> 00:09:40.840 In the 129 00:09:40.660 --> 00:09:46.120 oven they are subjected to a temperature of 500 degrees Fahrenheit for five hours. 130 00:09:48.080 --> 00:09:53.220 At the end of the five-hour period the samples are removed and reweighed for 131 00:09:53.220 --> 00:09:56.640 volatile loss and measured for softening point increase. 132 00:09:57.100 --> 00:10:00.280 The results of the kettle 133 00:10:00.280 --> 00:10:05.540 stability test are shown on these charts. Note how the weight loss of Aquadam 134 00:10:05.540 --> 00:10:11.100 compares favorably with that of the dead level asphalts and is infinitely less 135 00:10:11.100 --> 00:10:12.100 than the weight 136 00:10:11.940 --> 00:10:17.680 loss sustained by coal tar pitch. Notice too that while all bitumens are 137 00:10:17.680 --> 00:10:18.740 susceptible to a 138 00:10:18.740 --> 00:10:24.140 softening point increase to some degree, the softening point increase of dead level asphalts 139 00:10:24.140 --> 00:10:29.980 was twice that of Aquadam and the softening point increase of coal tar pitch was 140 00:10:29.980 --> 00:10:31.400 many times that of 141 00:10:31.400 --> 00:10:37.340 Aquadam. Another quality that an architect or engineer would look for 142 00:10:37.340 --> 00:10:38.860 is the degree of 143 00:10:38.860 --> 00:10:44.800 adhesiveness of a bitumen. High adhesive properties result in more effective 144 00:10:44.800 --> 00:10:46.280 brooming in of the 145 00:10:46.280 --> 00:10:50.240 felts, less chance of air pockets and potential blisters. 146 00:10:50.960 --> 00:10:53.860 Mineral surfacing is held and kept 147 00:10:53.860 --> 00:10:59.650 in its proper place. The adhesion test is made by warming 148 00:10:59.650 --> 00:11:01.930 films of two ordinary bitumens 149 00:11:01.930 --> 00:11:07.770 and a film of Aquadam. They are raised to specific temperatures and 150 00:11:07.770 --> 00:11:09.850 then roofing felts are brought 151 00:11:09.850 --> 00:11:15.690 into contact with the warm bitumens. Notice that with only brief contact the other 152 00:11:15.690 --> 00:11:16.690 samples do not 153 00:11:16.610 --> 00:11:20.410 hold while Aquadam bonds readily to the felt. 154 00:11:21.810 --> 00:11:25.270 It is important too that a bitumen provide good 155 00:11:25.270 --> 00:11:31.010 adhesion to gravel when used. Here is a gravel adhesion test being 156 00:11:31.010 --> 00:11:32.010 performed on 157 00:11:31.810 --> 00:11:37.750 Aquadam and other dead level bitumens. As before, films 158 00:11:37.750 --> 00:11:39.430 of the various bitumens are 159 00:11:39.430 --> 00:11:44.470 warmed to specific temperatures. Gravel is then sprinkled over the films. 160 00:11:47.440 --> 00:11:48.440 After a 161 00:11:48.360 --> 00:11:52.260 period of 30 seconds, the containers are turned upside down. 162 00:11:54.280 --> 00:11:55.620 When the containers 163 00:11:55.620 --> 00:11:59.640 are turned right side up, the amount of gravel loss is evident. 164 00:12:00.020 --> 00:12:02.320 The first two samples show little, 165 00:12:02.420 --> 00:12:08.340 if any, adhesion to the gravel. Aquadam shows excellent 166 00:12:08.340 --> 00:12:10.860 adhesion and that is most important 167 00:12:10.860 --> 00:12:14.260 to guard against gravel erosion on a dead level roof. 168 00:12:15.640 --> 00:12:18.540 The next quality, which a superior roofing 169 00:12:18.540 --> 00:12:22.700 bitumen should possess, is an ability to withstand water immersion. 170 00:12:23.800 --> 00:12:25.640 Parts of some dead level roofs, 171 00:12:25.640 --> 00:12:31.460 for one reason or another may be under water for long periods at a time and it is important 172 00:12:31.460 --> 00:12:36.700 to the architect and the engineer to select a bitumen that is not affected or 173 00:12:36.700 --> 00:12:37.700 changed by 174 00:12:37.580 --> 00:12:43.440 standing water here samples of the various bitumens are first weighed 175 00:12:43.440 --> 00:12:44.720 and then covered 176 00:12:44.720 --> 00:12:50.580 with one inch of distilled water at weekly intervals the water is poured from the surface 177 00:12:50.580 --> 00:12:56.420 and the bitumen blotted dry. Then the quantity of water absorbed by the bitumen 178 00:12:56.420 --> 00:12:57.420 is determined 179 00:12:57.400 --> 00:13:03.100 by reweighing the sample. The samples are also examined at the same time 180 00:13:03.100 --> 00:13:04.520 to see what effect 181 00:13:04.520 --> 00:13:10.260 immersion in water may have caused, such as swelling, discoloring, or breaking down 182 00:13:10.260 --> 00:13:11.260 of the 183 00:13:10.700 --> 00:13:16.520 bitumen. In this test, definite conclusions were not arrived at until 184 00:13:16.520 --> 00:13:18.160 after one year's immersion 185 00:13:18.160 --> 00:13:24.120 of all samples. As you can see, Aquadam is stable in its reaction to water 186 00:13:24.120 --> 00:13:25.440 immersion and remains 187 00:13:25.440 --> 00:13:31.740 unchanged after a year's test. Commercial dead level asphalt show a distinct change in 188 00:13:31.740 --> 00:13:37.720 characteristics in the same time. Still another quality to look for in 189 00:13:37.720 --> 00:13:39.120 the ideal roofing bitumen 190 00:13:39.120 --> 00:13:44.540 is its ability to flow and thereby level and smooth itself at average 191 00:13:44.540 --> 00:13:45.680 sunroof temperatures. 192 00:13:45.680 --> 00:13:51.300 Here is a test that scientifically measures the flow characteristics 193 00:13:51.300 --> 00:13:52.300 of different 194 00:13:52.100 --> 00:13:58.240 bitumens. Cubes of various samples are placed in V-shaped preheated metal troughs which 195 00:13:58.240 --> 00:14:04.100 have a 30-degree slope. The troughs are placed in an oven which is 196 00:14:04.100 --> 00:14:05.320 heated to sun temperature. 197 00:14:07.780 --> 00:14:10.860 After six hours, the flow rates are recorded. 198 00:14:11.460 --> 00:14:15.000 The Aquadam sample in the middle shows a relatively 199 00:14:15.000 --> 00:14:21.280 uniform flow which averages midway between coal tar pitch at the left and 200 00:14:21.280 --> 00:14:26.900 dead level asphalt on the right. Aquadam's medium degree of flow 201 00:14:26.900 --> 00:14:27.920 is considered 202 00:14:27.920 --> 00:14:33.580 ideal. Coal tar pitch is recognized as having too great a flow with a tendency 203 00:14:33.580 --> 00:14:37.820 to leave bare spots at the high points of the roof. On the other hand the 204 00:14:37.820 --> 00:14:42.920 average asphalt usually possesses too little flow which is insufficient for 205 00:14:42.920 --> 00:14:47.500 good leveling and sealing characteristics which are so important to a well-built 206 00:14:47.500 --> 00:14:49.520 roof you have 207 00:14:49.520 --> 00:14:54.500 seen through these tests how Aquadam meets all of the requirements of a superior 208 00:14:54.500 --> 00:14:55.500 roofing bitumen 209 00:14:55.400 --> 00:15:01.340 for dead level or low pitched roofs it has a uniform rate of flow the 210 00:15:01.340 --> 00:15:02.720 ability to stand water 211 00:15:02.720 --> 00:15:09.060 immersion a high degree of adhesiveness the ability to retain its original characteristics 212 00:15:09.060 --> 00:15:14.740 when heated, high ductility, the ability to heal itself, 213 00:15:15.040 --> 00:15:16.600 and finally the 214 00:15:16.600 --> 00:15:19.260 ability to withstand weather while in service. 215 00:15:20.600 --> 00:15:25.380 Because it meets all of these important requirements for a long-lasting roofing 216 00:15:25.380 --> 00:15:26.760 bitumen, smooth 217 00:15:26.760 --> 00:15:32.780 surfaced Aquadam roofs built with asbestos felts are being specified and used more and 218 00:15:32.780 --> 00:15:38.560 more and when desired Aquadam roofs are also available in a slag or gravel 219 00:15:38.560 --> 00:15:39.740 surface specification 220 00:15:42.360 --> 00:15:47.720 a superior bitumen is of prime importance but there are other elements which are necessary 221 00:15:47.720 --> 00:15:53.680 to build a roof of quality proper insulation is one of those other elements and it 222 00:15:53.680 --> 00:15:54.680 is particularly 223 00:15:54.280 --> 00:15:59.100 significant when temperature conditions in the manufacturing process must be 224 00:15:59.100 --> 00:16:00.100 closely regulated 225 00:16:00.000 --> 00:16:06.000 roof and so provides such insulation it is made of wood fibers processed 226 00:16:06.000 --> 00:16:07.700 into a homogeneous board 227 00:16:07.700 --> 00:16:13.700 roof and so has great structural strength and resistance to compression yet it is 228 00:16:13.700 --> 00:16:14.700 light in 229 00:16:14.080 --> 00:16:20.440 weight it can be handled without distortion breaking or delamination it is sufficiently 230 00:16:20.440 --> 00:16:26.320 rigid to permit normal traffic during the installation of both the insulation and the 231 00:16:26.320 --> 00:16:30.940 roof above it and it has been designed to secure the lowest possible conductivity 232 00:16:30.940 --> 00:16:32.680 consistent with 233 00:16:32.680 --> 00:16:37.920 structural strength another important element is the flashing 234 00:16:37.920 --> 00:16:40.360 even the best of built-up roofs 235 00:16:40.360 --> 00:16:46.080 can fail if improperly flashed for this purpose the Asbestile system of flashing 236 00:16:46.080 --> 00:16:47.080 was developed 237 00:16:48.400 --> 00:16:53.300 to start the flashing installation the ends of the new roofing felts are turned up dry 238 00:16:53.300 --> 00:16:57.800 over the cant strip and on up the parapet wall a short distance. 239 00:16:58.240 --> 00:17:00.740 Then the masonry wall is primed. 240 00:17:01.640 --> 00:17:04.780 Next a sheet of asbestos felt is mopped in place. 241 00:17:05.160 --> 00:17:08.380 This felt is covered by a sheet of base flashing, 242 00:17:08.580 --> 00:17:14.560 also mopped in place. Then along their upper edge the two felts are 243 00:17:14.560 --> 00:17:17.800 nailed into a brick joint. Now 244 00:17:17.800 --> 00:17:23.500 over this base flashing, the cap flashing is placed using Asbestile, a 245 00:17:23.500 --> 00:17:24.500 heavy-bodied 246 00:17:24.240 --> 00:17:28.460 plastic cement specially developed to give thorough water tightness. 247 00:17:28.780 --> 00:17:34.000 The cap flashing consists of a troweling of Asbestile, a ply of felt, 248 00:17:34.180 --> 00:17:35.600 a second troweling 249 00:17:35.600 --> 00:17:41.120 of Asbestile, a second ply of felt, and a final troweling of Asbestile. 250 00:17:41.120 --> 00:17:47.400 This cap flashing extends under the coping and down the wall, overlapping the 251 00:17:47.400 --> 00:17:53.360 base felts. The last step is the stripping in of an asbestos felt laid in 252 00:17:53.360 --> 00:17:54.360 hot bitumen 253 00:17:53.960 --> 00:17:57.340 along the joint of the base flashing and the finished roof. 254 00:17:59.470 --> 00:18:01.550 Thus, a completely dependable 255 00:18:01.550 --> 00:18:08.150 built-up roof is produced. A roof that is backed by 100 years of experience in pioneering 256 00:18:08.150 --> 00:18:12.630 new materials and methods for the roofing industry. Among those 257 00:18:12.630 --> 00:18:18.290 accomplishments are asbestos felts, roof and so,l the asbestos 258 00:18:18.290 --> 00:18:19.450 system of flashing, 259 00:18:19.690 --> 00:18:25.490 Flexstone roofs for inclines of one-half inch to six inches, and now 260 00:18:26.270 --> 00:18:29.610 Aquadam roofs for low pitch and dead level roofs. 261 00:18:30.610 --> 00:18:32.410 But it is not enough that 262 00:18:32.410 --> 00:18:36.210 the built-up roofing products be manufactured to the highest standards of 263 00:18:36.210 --> 00:18:42.090 quality. To ensure a roof of maximum wear and service, a built-up roof must also be 264 00:18:42.090 --> 00:18:45.310 properly applied by competent and reliable roofers. 265 00:18:46.630 --> 00:18:48.170 That is why Johns- 266 00:18:48.170 --> 00:18:53.090 Manville insists that its products be applied only by approved roofers who are 267 00:18:53.090 --> 00:18:57.790 selected for their experience, their know- how, and for their reputation in 268 00:18:57.790 --> 00:19:02.790 their business community. They are identified in your neighborhood by this 269 00:19:02.790 --> 00:19:07.590 heading in the yellow pages of the classified telephone directory and by 270 00:19:07.590 --> 00:19:13.170 this sign at their place of business 100 years have gone by 271 00:19:13.170 --> 00:19:14.730 since H.W. Johns 272 00:19:14.730 --> 00:19:20.630 developed his improved roofing felt today the company he founded 273 00:19:20.630 --> 00:19:21.630 is entering 274 00:19:21.130 --> 00:19:26.830 its second century of service to architects engineers contractors and 275 00:19:26.830 --> 00:19:27.830 building owners. 276 00:19:29.790 --> 00:19:32.410 Utilizing its complete research facilities 277 00:19:32.410 --> 00:19:35.530 and vast experience, Johns-Manville 278 00:19:35.530 --> 00:19:38.930 will continue to lead in the development and perfection 279 00:19:38.930 --> 00:19:42.370 of new products to meet new construction concepts. 280 00:19:43.490 --> 00:19:47.350 Thus, materials offering the very best in protection 281 00:19:47.350 --> 00:19:50.450 and security will always be on hand 282 00:19:50.450 --> 00:19:52.810 for the buildings which will come into being 283 00:19:52.810 --> 00:19:55.410 as the future unfolds.