Beaverboard®, black board, buffalo board, gray board, cane board, Celotex®, Homasote®, Insulite®, Nu-Wood® are some of the many names of fiberboard or plant-fiber board sheathing products used on roofs, exterior walls, interior walls & ceilings.
It's a wood fiber board with a thin asphalt coating often called "buffalo board" or "beaverboard", the trade name of the long defunct Beaver Board Co.
Unless the fiberboard actually absorbed water, can't be dried, and / or is damaged, replacing it is not likely to be cost effective nor necessary. Unless there is a serious mold problem I'd leave the sheathing in place.
This board is designed to be used as a substrate material in low-slope roofing. It can be installed over wood, rigid insulation or as a recovery board over an existing roof surface to be re-roofed.
Asbestos in Low Density Board (LDB) "Fiberboard" Products. Some low density fiberboard products like those described here were widely manufactured and distributed including in the U.K. and Australia; these products are particulary hazardous if disturbed as they are soft and they contain high levels of asbestos.Dec 15, 2012
Fiberboard Structural Sheathing Cons: Fiberboard sheathing has less strength than OSB. Fiberboard requires products or techniques to provide wind bracing and rigidity to the structure. Fiberboard sheathing does not hold screws well; it is also easy to strip the screw holes.Mar 25, 2020
Fiberboard was not "designed to get wet" as CRS offered in his opinion. Fiberboard or insulating board was traditionally treated with a water resistant surface coating such as wax or asphalt; that product was designed to shed water or to resist moisture.
Fibreboard is an engineered wood wallboard made of wood chips, plant fibres, softwood flakes, sawdust and other recycled materials such as cardboard or paper, all bonded with a synthetic resin under high pressure and heat and then compacted into rigid sheets.May 3, 2013
There's no real benefit to fiberboard other than it's cheap. You'd get more strength with oriented strand board or plywood, both of which are readily available.Jul 10, 2009
A cover board is a thin substrate to which a roof membrane is adhered. However, the use of a cover board far exceeds that of a substrate — it also serves as a critical component that helps to extend the life of a roof.
Elastomeric roofing membranes, modified bitumen membranes, or built-up roofing may be heat-welded or hot-mopped directly to STURDY-DEK. The asphalt board then becomes an integral part of the roof membrane, making it stronger and more puncture-resistant. Dimensionally stable, water-resistant, tough, durable panels.
Overview. DensDeck Roof Board's patented design features a gypsum core with embedded glass mat facers on the top and bottom of the board. DensDeck can be used in a variety of commercial roof systems and provides an excellent thermal barrier as well as exceptional fire, moisture, and wind uplift resistance properties.Feb 15, 2021