Foamed building board composite and method of making same
AssigneeManville Corporation
InventorsDon A. Forte, Jeffrey T. Kates, Dennis R. Larratt
Life of this patent
Estimating the term…
Abstract
A sheathing board capable of transmitting water vapor while retaining good thermal conductivity properties. The board is formed of a core comprising rigid foamed plastic interspersed with spaced areas of water vapor permeable insulating material that extend from one major face of the core to the other. The major faces of the core are preferably faced with a water vapor permeable sheet, allowing water vapor to travel through the spaced areas of insulating material and the facing sheets. By aligning the spaced areas of material with the insulation in a wall cavity, the strength of the board and its thermal conductivity are maintained within acceptable limits.
Claims30
A composite building board, comprising:
- opposite major surfaces;
- the board being comprised of a first material which is relatively impermeable to water vapor;
- the board including spaced areas extending from one major surface to the other, each area being comprised of a second material which is relatively permeable to water vapor;
- whereby water vapor is transmissible through the second material of the board.
A building wall construction, comprising:
- exterior end faces and interior end faces;
- thermal insulation between the side faces of the studs;
- an interior wall panel attached to the interior end faces of the studs;
- an exterior sheathing panel attached to the exterior end faces of the studs;
- the sheathing panel having opposite major surfaces and being comprised of a first material which is relatively impermeable to water vapor and a plurality of spaced areas of a second material which is relatively permeable to water vapor, the areas of the second material extending from one major surface of the panel to the other, the sheathing panel surfaces between adjacent studs containing at least one area of the second material;
- whereby water vapor is transmissible through the areas of the second material of the sheathing panel.
A method of manufacturing a composite building board, comprising the steps of:
- depositing on a support surface liquid or semi-liquid chemicals designed to form a foam which is relatively impermeable to water vapor;
- depositing a second material which is relatively permeable to water vapor onto the support surface at spaced locations transversely of the support surface;
- causing the foam to expand to a predetermined thickness, the second material extending from the support surface throughout the thickness of the foam and being bonded to adjacent surfaces of the foam material;
- and
- removing the foamed material from the support surface.
Dependencies are inferred from the claim text.