MIL-HDBK-1001-5 Roofing And Waterproofing S/S By Mil-Std-3007This handbook sets forth guidelines for design of roofing, LAYOUT 1 and waterproofing systems for building construction. It covers design of new low-slope and steep roof systems, reroofing of existing buildings, and waterproofing, and dampproofing systems.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47 - 48 - 49 - 50 - 51 - 52 - 53 - 54 - 55 - 56 - 57 - 58 - 59 - 60 - 61 - 62 - 63 - 64 - 65 - 66 - 67 - 68 - 69 - 70 - 71 - 72 - 73 - 74 - 75 - 76 - 77 - 78 - 79 - 80 - 81 - 82 - 83 - 84 - 85 - 86 - 87 - 88 - 89 - 90 - 91 - 92 - 93

MIL-HDBK-1001/SA

loss of plasticizer. Unreinforced, they have an extremely high coefficient of thermal contraction-expansion. However, reinforcement (woven fiberglass mat or polyester reinforcement) can vastly improve dimensional stability.

6.1.1.3 Uncured Elastomers. Uncured elastomers are chemically intermediate between the thermosetting (i.e., elastomeric) and thermoplastic polymers. The single-ply membranes containing these intermediate polymers are CPE (chlorinated polyethylene), CSPE (chlorosulfonated polyethylene, known commercially as Hypalon), and PIB (polyisobutylene).

Relative to elastomeric and thermoplastic sheets, advantages are:

a) lap seams can be heat-or adhesive-bonded.

b) easier field-forming of reliable lap seams;

c) may cure or vulcanize over a period of time and become thermosets.

A major disadvantage is that they lack the abrasion resistance of vulcanized rubber. Another disadvantage of CSPE is that after it has cured, it is difficult to repair using heat- bonding methods.

6.1.1.4 Modified Bitumens. Modified bitumens are essentially rubberized asphalts. The addition of rubber to the asphalt imparts elastomeric properties to the asphalt and increases the membrane's breaking strain by a factor of 10 or more compared with a conventional built-up bituminous membrane's breaking

strain. The polymers used to make these physical improvements in the modified-bitumen membranes include atactic polypropylene (APP), styrene-butadiene rubber (SBR), and styrene-butadiene- styrene block polymer (SBS). Reinforcement is generally

polyester or glass fibers, sometimes in combination.

The Canadian General Standards Board (CGSB) divides modified bitumen membranes into three categories:

a) By exposure: Type 1, exposed (always anchored); Type 2, shielded (anchored or loose-laid);

b) By surfacing: Class A, granule-surfaced; Class B, metallic-surfaced; Class C, plain-surfaced;