Division 7 Ebook Page 444 FOAMULAR DURAPINK Insulation, 07 22 16

FOAMULAR Insulation, PRMA, Horizontal Waterproofing B. Apply only as much FOAMULAR waterproofing insulation as can be covered by the protective mat and ballast on the same day. C. Place insulation directly on the membrane with the [channel side down, rib side up]. Apply roof insulation in parallel rows with end joints staggered. Install side and end joints closely but do not force together. Install to within 3/4 inch of all projections and cant strips. D. [In a multiple layer application, apply panels parallel to the preceding layer but with side and end joints staggered in relation to the preceding layer.] In multiple layer applications FOAMULAR 404 or 604 can be placed as a bottom, membrane level, drainage layer with upper layers completed using 400 or 600. E. [Insulation placed over hot fluid, BUR or other systems to which the PRMA insulation may adhere shall be separated from the membrane by a non-degradable sheet as recommended by the membrane manufacturer that will prevent the insulation from bonding to the membrane.] [PRMA insulation placed over chemically incompatible membrane systems such as coal tar or PVC shall be separated from the membrane by a separator sheet as recommended by the membrane manufacturer.] PROTECTIVE MAT A. Install protective mat fabric over the FOAMULAR layers, perpendicular to the long dimension of the insulation boards. The fabric shall be unadhered and unattached. The protective mat acts as a sieve layer preventing the penetration of debris or fine grade stone ballast into insulation board joints which may work their way down to the membrane level presenting a puncture hazard. It also limits the flotation of an individual board during periods when the membrane surface is flooded. Fabric is required between the insulation and ballast if stone ballast is used. Fabric is recommended for use under pavers. B. Overlap all fabric edges a minimum of 12". Extend the fabric 2 to 3 inches above the ballast at the roof perimeter and penetrations. The fabric shall be extended to the base of drain bonnets, but shall not cover the drain or restrict flow to the drain. C. Additional fabric shall be installed around penetrations to prevent fine grade stone ballast from entering the space between the penetration and the insulation. Wetting the protective mat fabric helps hold it in place over the insulation as the ballast is installed. It is also helpful to install the fabric so that the wind direction is with the laps rather than against the laps. Immediately following the application of the fabric it is necessary to install the stone or gravel ballast. Particularly on windy days, the stone should be installed soon after the fabric in order to help prevent blow-off of unballasted fabric and insulation. BALLAST Note to Specifier: Before specifying a PRMA system, it must be determined that the ballast dead load required will not exceed the dead load limits of the structure. A. Ballasting Requirements: Weight of ballast installed must be sufficient to provide protection against wind uplift pressure. The necessary weight per square foot, gradation and application surface areas shall be determined in accordance with ANSI/RMA/SPRI RP-4, Wind Design Guide for Ballasted Single-Ply Roofing Systems. B. Protect membrane and place ballast in accordance with building parameters and the ANSI/RMA/SPRI/RP- 4 document. C. [Stone ballast gradation and quantity installed (i.e., depth) must be adequate to completely cover the protective mat.] Insulation thickness does not affect the amount of ballast required. ROOF BOARD INSULATION 07 22 16 - 8

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