Roof Cover Board Thickness

Superior dimensional stability over competitive gypsum fiber boards is due to their low coefficient of thermal and hygrometric expansion.

Roof cover board thickness.

Available wood thickness standard 7 16 or 5 8 thick rated 1 osb. 1 4 spans flute widths up to 2 5 8 flexural strengths parallel lbs. Cover boards should be set over the bottom layer of insulation. R values 28 tested in accordance with astm c518 spannings.

Hail is damaging to insulation but by using a cover board the impact is minimized. Coated fiberglass facer ideal for fully adhered systems provides a broader compatibility and higher performance with roofing adhesives. 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. The 1 architecturally specified fiberglass mat gypsum roof cover board for nearly 30 years 1.

In addition national roofing contractors association nrca has issued bulletins over the years recommending the use of cover boards to minimize damage to polyiso. Meets the requirements of astm c 1177. To prevent blistering with built up roof membranes bur and to provide a separation layer and flat surface in re cover situations. 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.

The building is more susceptible to hail fi re and wind damage. 1 4 dens deck roof board. Can be used as a cover board in re roofing and new construction proven to reduce the tendency for blistering in hot asphalt applications. Fm class 1 for fire barrier requirements and ul class a unlimited slope with excellent surface burning characteristics.

Cover boards have historically had two uses. Structodek is lightweight compared to many other roofing cover boards and it is fiberglass free and cuts with a standard utility knife. Insulation damage results in a reduction of the roof s thermal resistance or r value. Without a cover board the roof is missing added durability.

Wood edges are routed 1 8 to allow for expansion and contraction of the wood. 5 8 thickness meets the requirements of type x per astm c 1177. The greatest risks to roofs aren t always seen. R value is the measure.