Static structures (e.g. – buildings) – Controlled by condition responsive means
Patent
1978-11-13
1980-09-23
Perham, Alfred C.
Static structures (e.g., buildings)
Controlled by condition responsive means
52173R, 52199, 52302, E04F 1704
Patent
active
042234867
ABSTRACT:
A system of automatically transferring vacuum uplift on the top of a roof to the underneath side of the roof membrane to shift the uplift pressure forces into the roof insulation and decking rather than on the roof membrane to prevent upward movement of the membrane and roof layer. A roof structure provided with one or more oneway or duckbill valves placed 3 feet in from the perimeter and on every outside corner at 50 foot intervals, which at their bases open into the area between a loosely laid membrane and the roof insulation in order to equalize the positive air pressure between the loosely laid membrane and the insulation with the minus air pressure which occurs on the top of the roof when wind blows across the roof. Each equalizer ventilator consists of a vent in which is operatively placed a oneway valve which is opened under the influence of the minus pressure on top of the roof combined with the positive pressure which exists between the loosely laid membrane and the insulation to equalize these two pressures and prevent uplift of the loosely laid membrane. The plurality of oneway valves appear on a roof in different locations dependent upon the type of roof, as well as being dependent upon adjacent structures.
REFERENCES:
patent: 2192458 (1940-03-01), Swenson et al.
patent: 2833229 (1958-05-01), Donegan
patent: 3817009 (1974-06-01), Elder
patent: 3984947 (1976-10-01), Patry
patent: 4005557 (1977-02-01), Kramer
LandOfFree
Roof equalizer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Roof equalizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Roof equalizer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-639204