Roof construction with stabilized Z-purlins

Details Roof construction with stabilized Z-purlins Roof construction with stabilized Z-purlins

1979-04-02

1983-10-11

Murtagh, John E.

Static structures (e.g., buildings)

Inclined top cover

On existing roof

E04B 700, E04D 1300

Patent

active

044084234

ABSTRACT:
A roof construction having at least one roof slope is disclosed wherein at least four Z-purlins are laid across and secured to a number of rafters on the roof slope in a building and the roof deck is then secured on top of the Z-purlins. Tendencies toward Z-purlin roll over failure are counter balanced when at least two of the Z-purlins on the roof slope are oriented to face downwardly of the roof slope and at least two of the Z-purlins on the roof slope are oriented to face upwardly of the roof slope. The downwardly and upwardly oriented Z-purlins may be arranged in pairs of adjacent Z-purlins, each pair comprising one upwardly and one downwardly facing Z-purlin, or so that Z-purlins of one group face upwardly and Z-purlins of the other group face downwardly. The Z-purlins are stabilized by means of stiffeners secured to the purlins at bearing points and by means of tie straps extending between adjacent purlins.

REFERENCES:
patent: 2314979 (1943-03-01), Gunn
patent: 3092221 (1963-06-01), Parsons
patent: 3157251 (1964-11-01), Rasch
patent: 3796014 (1974-03-01), Garbrick
patent: 3849012 (1974-11-01), Krouse
patent: 3973367 (1976-08-01), Johnson

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