Division 7 Ebook Page 429 FOAMULAR Insulation, New Roof, Below Membrane, 07 22 16

FOAMULAR , Thermal, Tapered Roof Insulation 3.1.1.6 BALLAST A. If needed. Before selecting this roofing system, it must be determined that the ballast system designed will not exceed the dead load limits of the structure. B. Ballasting Requirements: 1. 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/SPRI RP-4, Wind Design Guide for Ballasted Single-Ply Roofing Systems. 2. Ballast gradation and quantity installed, i.e., depth must be adequate to completely cover the membrane. Insulation thickness does not affect the amount of ballast required. 3. Protect membrane and place ballast in accordance with membrane manufacturer's instructions. C. [For ballasted roofing systems (including PRMA*) with no cover board over the XPS,] black/dark (non- white) roofing membranes (or filtration fabrics in PRMA) over THERMAPINK and FOAMULAR insulation shall be ballasted immediately after placement to prevent potential heat damage from sun exposure and wind displacement of the insulation under the membrane/fabric. D. [For mechanically attached and fully adhered roofing systems,] in areas where black/dark membranes are used and where "reflected solar energy" is expected to be present, THERMAPINK and FOAMULAR need protection in addition to normally specified cover boards. For example, roof areas adjacent to higher walls, particularly walls with reflective surfaces, or near large rooftop HVAC units, or near or in between clusters of mechanical equipment, or near other structures with reflective cladding (metal or glass); or near higher reflective parapets, all such areas should be considered for additional heat protection. Such roof areas must be covered with pavers or ballast. Black/dark (non-white) membranes must be coated with white reflective topping, and maintained white, to avoid damage due to the intensified heat exposure from reflected sun in such areas. E. [Upon completion of ballasted roof construction the owner's representative must verify that installation is in accordance with design specifications such as adequate ballast gradation, rate of coverage and areas covered.] 3.1.1.7 [FASTENERS] A. Fastener/stress plate assemblies shall be driven to tightly secure the insulation board and seat the plate but shall not be overdriven so that the Tapered [THERMAPINK, FOAMULAR] board is crushed beneath the plate. B. Fasteners which are improperly installed shall be removed or corrected. Improper installation may include overdriving such that the stress plate is concave and cuts a significant depression in the insulation; underdriving such that the fastener head is not properly seated in the stress plate and may puncture the membrane; broken or bent shanks; improper location; or insufficient length. C. Fasteners shall be embedded in the deck per manufacturer's recommendations to insure adequate withdrawal resistance. D. Tapered [THERMAPINK, FOAMULAR] shall be secured with 4 fasteners and 3" diameter stress plates per 2' x 8' board. ROOF BOARD INSULATION 07 22 16 - 7

Previous Page
Next Page