Fire-resistant manufactured-wood based siding
A manufactured wood based siding or cladding product made from an engineered wood composite including, but not limited to, oriented strand board (OSB), hardboard, plywood, and combinations thereof, with fire-resistant properties (e.g., resistance to flame spread, ignition and combustion) imparted during the manufacturing process. An engineered wood-based composite siding product (in various forms, including lap, panel or trim) possessing such material properties is better suited for meeting the requirements of certain communities or areas where building codes require such protection due to the risk of fires (such as those posed within the boundaries of the wildland-urban interface, WUI). Engineered or manufactured wood-based composite products are typically manufactured by assembling multiple layers, then consolidating these layers using heat and pressure. A “fines” layer comprising wood or lignocellulosic wood particles is currently applied to the face of engineered wood-based composite siding products (e.g., lap siding, panel siding, trim) to provide an appropriate outer appearance, or other features, to the product. In various exemplary embodiments, the present invention treats the particles that make up the “fines” layer before incorporation of the particles into the manufacturing process (i.e., “in-process”). The treatment comprises adding ingredients or additives (using appropriate methods) that impart desired protection when exposed to a fire event. Ingredients, for example, include various borate-based chemistries, minerals, or combinations thereof that impart the desired protection.
1. A product, comprising:
a multi-layered piece of siding with a substrate layer of engineered-wood and a fines layer, said substrate layer with a front face, back face, top edge, bottom edge, right edge, and left edge;
said fines layer positioned on the front face, said fines layer comprising lignocellulosic wood particles integrated with one or more fire-resistant additives absorbed by said lignocellulosic wood particles;
at least one embedded or inset strip of intumescent fire resistant material, inset or embedded in the front face or the back face, proximate the top edge or bottom edge, and extending the length of the piece of siding parallel to the top edge or bottom edge; and
a spline extending downward at an acute angle from the back face, proximate the bottom edge, and extending for at least a portion of the length of the piece of siding parallel to the bottom edge.
2. The product of claim 1 , wherein the one or more fire resistant additives comprise alumina trioxide, boric acid, sodium borate, or combinations thereof.
3. The product of claim 2 , further comprising pMDI adhesive resin.
4. The product of claim 1 , wherein the fines layer is pre-assembled into a mat or laminate prior to bonding to the substrate layer.
5. The product of claim 1 , further comprising a resin-impregnated overlay factory-applied to the fines layer, wherein the overlay comprises a fire-resistant primer or coating.
6. The product of claim 1 , further comprising a fire-resistant coating covering one or both ends of the piece of siding.
7. The product of claim 1 , wherein the spline extends the length of the piece of siding, and is configured to hold the bottom of the piece of siding proximate to the top of an adjacent piece of siding when installed on a building structure or frame.
8. The product of claim 7 , further wherein said at least one strip of intumescent fire resistant material comprises a first strip embedded in the back face between the spline and the bottom edge, said first strip extending the length of the piece of siding parallel to the bottom edge.
9. The product of claim 8 , wherein said intumescent fire resistant material expands when exposed to heat or flame.
10. The product of claim 8 , further comprising a second strip of intumescent fire resistant material embedded in the back face between the spline and the top edge, proximate to the spline.
11. The product of claim 1 , said at least one strip of intumescent fire resistant material comprises a first embedded or inset strip of intumescent fire resistant material, and a second embedded or inset strip of intumescent fire resistant material.
12. The product of claim 1 , wherein the lignocellulosic wood particles are pre-treated with said one or more fire-resistant additives, and
further wherein said one or more fire resistant additives provide one or more of resistance to flame spread, resistance to ignition, and resistance to combustion.
13. The product of claim 1 , wherein the engineered-wood substrate is one or more of oriented strand board (OSB), plywood, or hardboard.
14. The product of claim 1 , wherein the piece of siding is one or more of a piece of lap siding, panel siding, or trim.
15. The product of claim 1 , wherein the fines layer constitutes the face layer of the product, and said one or more fire-resistant additives are thoroughly and consistently applied throughout the face layer, and thus are configured to provide enhanced integrated fire protection and resistance.
16. The product of claim 1 , wherein the fines layer comprises wood-based fines with a basis weight ranging from about 200 pounds per thousand square feet to about 300 pounds per thousand square feet.
17. The product of claim 1 , wherein the fines layer is a pre-assembled mat or laminate.
18. The product of claim 1 , wherein the fines layer comprises a paperboard laminate with a thickness between 0.008″ and 0.048″.