Roof Overlay Board

R values 28 tested in accordance with astm c518 spannings.

Roof overlay board.

Under construction proprietary overlay. Composed of a closed cell polyisocyanurate foam core bonded in the foaming process to 1 2 thick duraboard an expanded perlite mineral aggregate board on one side and a fiber glass reinforced facer on the other. This is because you get to skip the whole process of tearing up the existing roof. 1 4 spans flute widths up to 2 5 8 flexural strengths parallel lbs.

Tin roofing also known as metal roofing is considered more durable than composition or wood shingles. Less expensive since you re simply adding another layer of shingles on top of the old roof your labor costs will be considerably. That is to say that laying down a new roof on top of the existing roof saves hours of labor. Ideal for re roof applications or as a new substrate for a modified bitumen or bur roofing membrane asphaltic cover boards are dimensionally stable providing strength and durability.

That process can be time consuming and messy so. The roofing is manufactured in panels that. Rigid roof insulation board. Where the roofstar guarantee standards or the roof system specifications call for taping fibreboard or insulation joints consult the list of accepted materials.

One major advantage of doing an overlay versus a tear off is the amount of labor involved. Asphalt and paraffin impregnated coated fibreboard roof insulation and insulation overlay board. It s light weight provides ease of handling. Labor for a new roof overlay.

It s for this reason that many people choose to go with an overlay roof rather than a full tear off. Installing wood stripping under a tin roof. A flat roof that had been over coated with a liquid based system which itself is breaking down a bonded overlay would not be suitable although with some preparatory works a mechanically fastened overlay system might be an option. The additional price is mostly related to the extra labor that goes into a tear off roof.