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.

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MIL-HDBK-1001/5A

14.3.3    Vapor Retarder.  Calculate the vapor pressure and flow direction and use vapor retarder where required.  (Refer to Section 4).

14.3.4    Insulation.  Insulation must have low water absorption and be of sufficient thickness to maintain membrane temperature above dew point.

14.3.5    Waterproofing Termination.  Terminate waterproofing at

8 inches (203 millimeters) above the finish wearing surface of

deck at all walls and other projections.

14.3.6    Flashings.  All flashings must project onto horizontal membrane a minimum 4 inches (102 millimeters) with two additional plies of stripping and terminate a minimum of 8 inches (203 millimeters) above finished grade of the plaza deck.  Require compatible elastomeric material to provide for movement.

14.3.7    Percolation Course.  Specify a percolation course 2 inches (51 millimeters) thick, below insulation. Use washed smooth round river rock to drain water from insulation and to promote free flow to drains.  Insulation board with preformed drainage channels is also acceptable.

14.3.8    Filter Fabric.  Specify filter fabric over the percolation or insulation course to prevent clogging from dirt or other debris.

14.3.9    Pavers.  Specify poured-in-place concrete slab wearing surface, pavers on mortar bed or pavers on pedestals.  Pavers on pedestals are recommended for easy access in case of leaks.  Do not specify bituminous wearing courses that require rolling for compaction.  Pavers must be set and elevated to allow sufficient opening between joints and substrate to filter ponded water to percolation course and into drains.  Pavers should bear firmly on all four corners.

14.3.10   Drains.  Drains must have weep holes at every sub- assembly level and flashed into waterproofing membrane.  (Consult drain manufacturers for special assemblies.)

14.3.11   Protection Boards.  Require protection boards for membrane and insulation, or both, depending on location of these components.

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