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A method for continuously producing an insulation board comprising a rigid plastic foam core having two major surfaces and a facing material on one or both of the major surfaces, the method including conveying a facing material along a production line, depositing a partially expanded froth foam of a

A method for continuously producing an insulation board comprising a rigid plastic foam core having two major surfaces and a facing material on one or both of the major surfaces, the method including conveying a facing material along a production line, depositing a partially expanded froth foam of a plastic mixture, which contains at least one frothing agent, on the facing material, and further expanding and curing the froth foam in contact wiht the facing material to form the insulation board. The board is particularly useful as roof insulation.

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[ We claim:] [1.] A method for continuously producing an insulation board comprising a rigid plastic foam core having two major surfaces and a .[.facing material.]. .Iadd.glass fiber mat .Iaddend.on at least one of the major surfaces, the method comprising:(a) conveying a .[.facing material.]. .Iadd

[ We claim:] [1.] A method for continuously producing an insulation board comprising a rigid plastic foam core having two major surfaces and a .[.facing material.]. .Iadd.glass fiber mat .Iaddend.on at least one of the major surfaces, the method comprising:(a) conveying a .[.facing material.]. .Iadd.glass fiber mat having a thickness of from 15 to 55 mils and comprising randomly oriented relatively short glass fibers .Iaddend.along a production line,(b) depositing a partially expanded froth foam, which contains at least one frothing agent, on the .[.facing material.]. .Iadd.glass fiber mat.Iaddend., the partially expanded froth foam comprising a mixture for forming a rigid polymer foam selected from the group consisting of polyurethane, polyisocyanurate, phenolic polymer, polyester and epoxide foams, and the frothing agent being easily vaporizable at atmospheric pressure, and(c) further expanding and curing the froth foam in contact with the .[.facing material.]. .Iadd.glass fiber mat .Iaddend.to form the insulation board.Iadd.;wherein the glass fiber mat has sufficient porosity to permit sufficient penetration of the mat by the frothed foam to provide integral attachment of the cured foam to the mat.Iaddend..