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A siding assembly and method of manufacture are disclosed. Each siding unit is a profile of a composite material which includes a thermoplastic polymer and a cellulosic fiber. The preferred siding unit has a tapered thickness and a convex face. Each siding unit is interconnected to adjacent siding u

A siding assembly and method of manufacture are disclosed. Each siding unit is a profile of a composite material which includes a thermoplastic polymer and a cellulosic fiber. The preferred siding unit has a tapered thickness and a convex face. Each siding unit is interconnected to adjacent siding units with a tongue and groove mechanism. The preferred siding profile has a plurality of webs, and the exposed portion of the siding has a capstock layer to improve weatherability. The exposed width of the siding's face may be adjustable. The siding units are interconnected end-to-end by inserts which are positioned by means of an adhesive or thermal welding.

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1. A siding assembly for an exterior wall surface of a building made of a plurality of siding units, said building having a support structure, each of said units comprising: (a) a siding profile made of a composite material including a thermoplastic polymer and a wood fiber, said composite materi

1. A siding assembly for an exterior wall surface of a building made of a plurality of siding units, said building having a support structure, each of said units comprising: (a) a siding profile made of a composite material including a thermoplastic polymer and a wood fiber, said composite material having a Young's modulus of at least 600,000 psi and a coefficient of thermal expansion of about 1.3×10-5in/in/degree F. to about 3×10-5in/in/degree F.; (b) an installation flange; and (c) said units adapted to be affixed to a building with similar units in overlapping horizontal courses with the units of each course lying in overlapping relation. 2. The siding assembly of claim 1 wherein the units and overlapping horizontal courses are installed with tongue and groove installation surfaces. 3. The siding assembly of claim 1 wherein the thermoplastic polymer comprises a thermoplastic polymer selected from the group consisting of polyolefin, polystyrene, polyacrylate, polyester and mixtures thereof. 4. The siding assembly of claim 1 wherein the thermoplastic polymer comprises a thermoplastic polymer selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, poly(ethylene-coproplyene) polyethylene-co-alphaolefin and mixtures thereof. 5. The siding assembly of claim 1 wherein the thermoplastic polymer comprises polyvinyl chloride. 6. The siding assembly of claim 1 wherein the thermoplastic polymer comprises polyethylene. 7. The siding assembly of claim 1 wherein the thermoplastic polymer comprises polypropylene. 8. The siding assembly of claim 1 wherein the thermoplastic polymer comprises poly(ethylene-coproplyene). 9. The siding assembly of claim 1 wherein the thermoplastic polymer comprises poly(ethylene-coproplyene). 10. The siding assembly of claim 1, wherein the composite material comprises about 30 to about 65 parts of wood fiber and about 50 to 70 parts of thermoplastic polymer per 100 parts of composite material. 11. The siding assembly of claim 1, wherein the siding unit is a solid member. 12. The siding assembly of claim 1, wherein the outer surface of the siding unit is planar. 13. The siding assembly of claim 1, wherein the siding unit includes a layer of capstock over at least a portion of the siding profile. 14. The siding assembly of claim 1, wherein said wood fiber has a fiber width of about 0.3 to 1.5 mm, a fiber length of about 0.2 to 1.2 mm, and an aspect ratio in the range of about 1.5 to 7.