US 4,730,421 AGranted

Pitch box

OwnerDavid F. Leelandinventor

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Abstract

A pitch box for sealing the junction between an upright elongated projection and the opening where it penetrates into the surface of a roof. The pitch box has a central tubular part which has a base adapted to be mounted against the roof surface surrounding the projection and adapted to extend upwardly generally coaxial with the longitudinal axis of the projection to provide a space surrounding the extension for receiving anchoring material. A collar surrounds the upper end of the tubular part and a bottom wall is provided between the bottom of the collar and a median point on the tubular part so that a trough is formed surrounding the upper end of the tubular part. The bottom of the trough has weep holes in it for discharging moisture. The top of the collar extends above the top of the tubular part. A porous material may be used to fill the bottom of the trough and the top of the collar is filled with tar or other sealant material which can be mounded up around the projection which extends upwardly through the pitch box.

Claims10

Dependent claims

For constructing and repairing roofs, in combination with a roof having an opening and a projecting element penetrating into said opening, a pitch box for sealing the junction between said element and said opening comprising:

a tubular body surrounding said projecting element and said opening with clearance between the outer surface of said element and the inside surface of said tubular body;
said body having an upright axis and terminating at its lower end in a base bearing flush against said roof surface around said opening, and terminating at its upper end in a free marginal end portion;
and
a collar surrounding said free marginal end portion in radially spaced relation thereto to provide an annular trough between said free marginal end portion of said body and said collar, said trough having a bottom wall means spaced above said base and below the upper end of said body, said wall means having a plurality of weep holes affording discharge of moisture from said trough through said weep holes, said collar extending above the level of said upper end of the tubular body so as to accommodate a waterproof sealant material extending from the interior surface of said collar to the exterior surface of said projecting element above the upper end of said tubular body.

1 more element

Dependencies are inferred from the claim text.