Roof Cover Board Thickness

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.

Roof cover board thickness.

1 4 spans flute widths up to 2 5 8 flexural strengths parallel lbs. Can be used as a cover board in re roofing and new construction proven to reduce the tendency for blistering in hot asphalt applications. Insulation damage results in a reduction of the roof s thermal resistance or r value. Fully adhered cover boards should be applied in accordance with proper roofing procedures.

Cover boards should be set over the bottom layer of insulation. Superior dimensional stability over competitive gypsum fiber boards is due to their low coefficient of thermal and hygrometric expansion. The greatest risks to roofs aren t always seen. 5 8 thickness meets the requirements of type x per astm c 1177.

1 4 dens deck roof board. Available wood thickness standard 7 16 or 5 8 thick rated 1 osb. R values 28 tested in accordance with astm c518 spannings. Cover boards have historically had two uses.

Fm class 1 for fire barrier requirements and ul class a unlimited slope with excellent surface burning characteristics. The building is more susceptible to hail fi re and wind damage. Wood edges are routed 1 8 to allow for expansion and contraction of the wood. 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.

Structodek is lightweight compared to many other roofing cover boards and it is fiberglass free and cuts with a standard utility knife. Hail is damaging to insulation but by using a cover board the impact is minimized. 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.

To prevent blistering with built up roof membranes bur and to provide a separation layer and flat surface in re cover situations. R value is the measure. Insulation cover boards training and education take advantage of industry leading training and education though care the center for the advancement of roofing excellence. In addition national roofing contractors association nrca has issued bulletins over the years recommending the use of cover boards to minimize damage to polyiso.