Insulating Concrete with Polystyrene Ventboard

Vermiculite Lightweight Concrete: Insulating Concrete with Polystyrene Ventboard

This system of superior insulating value consists of polystyrene board and vermiculite insulating concrete applied over structural bases of regular concrete, metal or wood. This system provides flexibility that will meet most design criteria. Insulating values can be varied by changing the thickness of the polystyrene board. Proper slope to drain can be obtained with the vermiculite concrete. Minimum thickness of the concrete shall be two inches.

"U" Factor Table (includes Built-up Roofing)

Thickness of Concrete over Ventboard	Thickness of Ventboard	Wt. Lbs. Per Sq. Ft.(Mtl.-Vent Bd. Concrete)	Depth of Corrugation 9/16" - 28 Gauge				Wt.Lbs. Per Sq. Ft.(Mtl.- Vent Bd. Concrete)	Depth of Corrugation 7/8" -- 26 Gauge				Wt. Lbs. Per Sq. Ft. (Mtl.- Vent Bd. Concrete)	Depth of Corrugation 1-5/16" - 24 Gauge
			No Ceiling Heat Flow		Ceiling Heat Flow			No Ceiling Heat Flow		Ceiling Heat Flow			No Ceiling Heat Flow		Ceiling Heat Flow
			Up	Down	Up	Down		Up	Down	Up	Down		Up	Down	Up	Down
2"	3/4"	5.64	.13	.12	.086	.083	6.29	.13	.12	.084	.081	7.06	.12	.11	.081	.079
	1"	5.66	.11	.11	.079	.076	6.31	.11	.11	.077	.075	7.08	.11	.10	.075	.073
	2"	5.75	.077	.075	.059	.058	6.41	.075	.073	.058	.057	7.18	.073	.071	.057	.056
2 1/2"	3/4"	6.68	.12	.11	.080	.078	7.33	.11	.11	.078	.076	8.10	.11	.10	.076	.074
	1"	6.70	.11	.10	.074	.072	7.35	.10	.098	.072	.070	8.12	.098	.094	.071	.069
	2"	6.80	.073	.071	.056	.055	7.45	.071	.069	.055	.054	8.22	.069	.068	.054	.053

Notes:

Add 6 lbs. per sq. ft. for built-up roofing.
Ceiling used in "U" value calculations is 1/4" Fiberglas lay-in panel.
Authority for "U" values based on ASHRAE Guide and test data by recognized independent laboratories.
Weights and "U" values may vary slightly dependent on corrugation depth variance of each sheet manufacturer.