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. It was an inexpensive exterior wall sheathing. Like.
Fiberboard products have been widely used on building exteriors as a non-structural wall sheathing, even on some roofs as roof sheathing, and on building interiors as a ceiling or wall covering.
When used with sound-deadening board and gypsum wallboard, outside walls become excellent sound barriers against outdoor noise. Fiberboard sheathing is water repellent, forms a weather-tight cover for walls, and eliminates the need for building paper with most sidings.
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.
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. Fiberboard sheathing is heavy because it is so dense, which can make it difficult to handle.Mar 25, 2020
For all structural purposes, plywood is much stronger than fiberboard, reveals Bob Vila. Plywood is made from several individual layers glued together perpendicular to each other to provide strength. Fiberboard is made from individual random chunks of wood glued together under pressure without grain patterns.
Hard fiberboard can be used as wall slab, door board, floor, furniture and other decorations instead of wood. And the soft fiberboard whose apparent density is low(< 400 kg/m3) and porosity is high, often used as heatproof or acoustical materials.
Exterior wall sheathing is either structural or non-structural. Structural exterior wall sheathing ties framing studs together, making the walls resistant to twisting and bending. However, most structural exterior wall sheathings lack insulation value.Mar 9, 2020
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
Is there Asbestos in Beaverboard? Sarah: No, BEAVERBOARD is a wood fiber product not an asbestos-product.Dec 15, 2012
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.
Fiberboard will not hold nails. You'll also want to check the siding manufacturer's warranty for their requirements and nailing schedule.Jun 7, 2021