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

Section 13: BELOW-GRADE WATERPROOFING

13.1      System Description.  Basic considerations for below- grade waterproofing are the same as for plaza waterproofing (refer to Section 14).  The below-grade location adds the extra requirement to handle probable static ground water pressure. Therefore, the primary objective is to drain away the water and prevent the build-up of hydrostatic pressure at the surface of the waterproofing.

For both horizontal and vertical surfaces, multiple- layer systems are superior.  These systems may be applied hot or cold.  Fluid-applied and single-ply sheet applications can be considered if conditions will not be severe and if access to the system in case of failure is relatively easy.  Bentonite clay panels are sometimes used for waterproofing, especially below slabs and on vertical walls.

13.2        Uses.  Below grade waterproofing may be required for basement slabs, foundation walls, planters, mud slabs, tunnels, sidewalk vaults, above-grade walls at earth berms, etc.

13.3      Precautions

13.3.1    Substrates.  Substrates must be free of laitance, sharp projections, facial imperfections, curing compounds, oil, grease, and moisture in any form.  In all cases, masonry requires priming with a material compatible with the selected membrane system.

13.3.2    Membrane.  Membrane reinforcing must be provided at all joints, reinforced, non-reinforced, or expansion joints.  (Refer to ASTM C 981, Guide for Design of Built-Up Bituminous Membrane Waterproofing Systems for Building Decks.) Reinforcing must also occur at all sharp turns, flashing terminations, penetrations, pedestals, drains, etc.

13.3.3    Membrane Protection.  Membranes must be protected with protection board of sufficient thickness to withstand anticipated abuse.  Boards conforming to ASTM C 208, Cellulosic Fiber Insulating Board, ASTM C 726, Mineral Fiber Roof Insulation

Board, or ASTM C 578, Type II Grade 2, are acceptable.

Single-ply sheet waterproofing requires immediate ultraviolet protection and/or backfilling to prevent blistering. In direct, hot sunlight, blistering can occur in 20 minutes or less on some materials.

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