Roof Cover Board Thickness

Cover boards have historically had two uses.

Roof cover board thickness.

R value is the measure. Without a cover board the roof is missing added durability. Cover boards should be set over the bottom layer of insulation. Insulation damage results in a reduction of the roof s thermal resistance or r value.

The cover board should be secured to the bottom layer of insulation in a full and even application of hot asphalt applied at a rate of 30 pounds per square or specially formulated adhesive. R values 28 tested in accordance with astm c518 spannings. 1 4 spans flute widths up to 2 5 8 flexural strengths parallel lbs. Superior dimensional stability over competitive gypsum fiber boards is due to their low coefficient of thermal and hygrometric expansion.

To prevent blistering with built up roof membranes bur and to provide a separation layer and flat surface in re cover situations. 1 4 dens deck roof board. Fm class 1 for fire barrier requirements and ul class a unlimited slope with excellent surface burning characteristics. In addition national roofing contractors association nrca has issued bulletins over the years recommending the use of cover boards to minimize damage to polyiso.

Can be used as a cover board in re roofing and new construction proven to reduce the tendency for blistering in hot asphalt applications. Stocked in 12 locations around the country to facilitate job start ups and completions structodek is available in 4 x4 and 4 x8 boards w56 358 8531 for a 4 x4 x board and w56 358 8532 for. Insulation cover boards training and education take advantage of industry leading training and education though care the center for the advancement of roofing excellence. Structodek is lightweight compared to many other roofing cover boards and it is fiberglass free and cuts with a standard utility knife.

5 8 thickness meets the requirements of type x per astm c 1177. The 1 architecturally specified fiberglass mat gypsum roof cover board for nearly 30 years 1. Learn how adding a densdeck prime or densdeck stormx prime roof board to your roof assembly can help thwart the common damage inflicted by water wind fire puncture and more. Meets the requirements of astm c 1177.

The greatest risks to roofs aren t always seen. Fully adhered cover boards should be applied in accordance with proper roofing procedures. Wood edges are routed 1 8 to allow for expansion and contraction of the wood. Available wood thickness standard 7 16 or 5 8 thick rated 1 osb.