FLASHING CONSTRUCTION
United States Patent 3585766
This invention relates to a flashing construction for a flat roof wherein a seat for a cant is first rigidly connected along the marginal edge of the roof. The cant is subsequently located in the seat. A flexible weatherproof flashing membrane is secured to the upper edge of the seat and adapted to cover the cant and merge with the roofing felt and roofing pitch to form a weathertight flashing construction. The principal advantage of the construction is that the roofing operation can be carried out by the roofers without the necessity of assistance from carpentry and other trades.
US Patent References:
Flashing
Cramer - November 1921 - 1396732
Snap in flashing
Reddy - May 1961 - 2984049
Combined flashing and fascia system and method of making same
Simpson - October 1968 - 3404495
Flashing
Cramer - November 1921 - 1396732
Snap in flashing
Reddy - May 1961 - 2984049
Combined flashing and fascia system and method of making same
Simpson - October 1968 - 3404495
Application Number:
04/831627
Publication Date:
06/22/1971
Filing Date:
06/09/1969
View Patent Images:
Export Citation:
Primary Class:
Other Classes:
52/94
International Classes:
E04D13/155; E04D13/15; E04D13/15
Field of Search:
52/60,58,96,94
Primary Examiner:
Faw Jr., Price C.
Claims:
What I claim as my invention is
1. A flashing construction for a flat roof comprising a seat for a cant, said seat having a seat base disposed to overlie a roof deck and a seat wall extending upwardly from said seat base, a cant located in an operative position with respect to said seat, a flexible weatherproof flashing membrane disposed to overlie said cant, securing means for securing one edge of said flashing membrane to said seat wall adjacent the upper edge thereof, and facia means assembled on said seat wall on the other side thereof from said membrane, the facia means including an upper portion shaped to overlie the upper edge of the seat wall and cover said one edge of said flashing membrane;
2. A flashing construction for a flat roof, as claimed in claim 1, in which said seat is L-shaped in longitudinal cross section, said seat base being the base of said L and said seat wall being the back of said L.
3. A flashing construction for a flat roof, as claimed in claim 1, in which said cant is a solid insulating material.
4. A flashing construction for a flat roof, as claimed in claim 1, in which said seat base and said seat wall are maintained in L formation by brackets spaced apart along the length of said seat.
5. A flashing construction for a flat roof, as claimed in claim 1, in which said seat is mounted at the marginal edge of a flat roof and said cant is located by said seat wall in an operative position with respect to said seat, and said securing means secures an edge of said flashing membrane to said seat wall adjacent the upper edge thereof, said flashing membrane overlying said cant and extending onto the flat portion of said roof and a weatherproof compound overlying said roof and the marginal portion of said flexible membrane that overlies said roof.
6. A flashing construction for a flat roof, as claimed in claim 5, in which said seat L-shaped in longitudinal cross section, said seat base being the base of said L and said seat wall being the back of said L.
7. A flashing construction for a flat roof, as claimed in claim 5, in which said cant is a solid insulating material.
8. A flashing construction for a flat roof, as claimed in claim 1, in which said securing means for securing said flashing membrane to said seat wall comprises clip means clamped over the upper edge of said seat wall and underlying the shaped upper portion of said facia means.
1. A flashing construction for a flat roof comprising a seat for a cant, said seat having a seat base disposed to overlie a roof deck and a seat wall extending upwardly from said seat base, a cant located in an operative position with respect to said seat, a flexible weatherproof flashing membrane disposed to overlie said cant, securing means for securing one edge of said flashing membrane to said seat wall adjacent the upper edge thereof, and facia means assembled on said seat wall on the other side thereof from said membrane, the facia means including an upper portion shaped to overlie the upper edge of the seat wall and cover said one edge of said flashing membrane;
2. A flashing construction for a flat roof, as claimed in claim 1, in which said seat is L-shaped in longitudinal cross section, said seat base being the base of said L and said seat wall being the back of said L.
3. A flashing construction for a flat roof, as claimed in claim 1, in which said cant is a solid insulating material.
4. A flashing construction for a flat roof, as claimed in claim 1, in which said seat base and said seat wall are maintained in L formation by brackets spaced apart along the length of said seat.
5. A flashing construction for a flat roof, as claimed in claim 1, in which said seat is mounted at the marginal edge of a flat roof and said cant is located by said seat wall in an operative position with respect to said seat, and said securing means secures an edge of said flashing membrane to said seat wall adjacent the upper edge thereof, said flashing membrane overlying said cant and extending onto the flat portion of said roof and a weatherproof compound overlying said roof and the marginal portion of said flexible membrane that overlies said roof.
6. A flashing construction for a flat roof, as claimed in claim 5, in which said seat L-shaped in longitudinal cross section, said seat base being the base of said L and said seat wall being the back of said L.
7. A flashing construction for a flat roof, as claimed in claim 5, in which said cant is a solid insulating material.
8. A flashing construction for a flat roof, as claimed in claim 1, in which said securing means for securing said flashing membrane to said seat wall comprises clip means clamped over the upper edge of said seat wall and underlying the shaped upper portion of said facia means.
Description:
This invention relates to a flashing construction for a flat roof.
Flat roofs are usually waterproofed by means of several layers of roofing felt overlaid with a mixture of pitch and gravel. It is usual to provide an upwardly sloping cant at the edges of the roof so that the roof, in effect, forms a basin. The cant must, of course, be flashed and means must be provided for making the flashing waterproof under all weather conditions. The roofing felts which underlie the pitch and gravel mixture terminate at the cant and special care must be taken to ensure that the termination of the felts is not open to weather and is not likely to become open to weather.
While there has been no serious difficulty in achieving a weathertight flashing construction at the edge of a flat roof in the past, it has been achieved only at considerable expense and inconvenience. The most usual method of constructing a roof flashing of this type involves the cooperation of at least the carpentry and the roofing trades and there is often difficulty in arranging for suitable time schedules. The carpenter will complete his work and the roofer is often not immediately available. This results in time lost in the building construction. Metal cant constructions, which do not require the cooperation of the carpentry trade, have been devised but they are complex and costly and have received little general acceptance. In addition to being complex and costly, they do not have the insulating value of the more solid fibrous cant construction.
This invention overcomes these disadvantages and provides a flashing construction for a flat roof that can be very simply applied and that does not require cooperation between carpentry and roofing trades in order to construct the roof flashing. The flashing is secure and waterproof and of good appearance. It is an improved flashing at a lesser cost.
Generally speaking, a flashing construction for a flat roof, according to this invention, comprises a seat for a cant, the seat having a base adapted for securement to a roof deck and a wall extending upwardly from the base, the base and wall being adapted to embrace a cant in an operative position. It has a flexible weatherproof flashing membrane and securing means along one edge of the membrane for securement to the wall of the seat adjacent the top thereof. The invention and its manner of use will be apparent after reading the following detailed specification, read in conjunction with the drawings.
In the drawings:
FIG. 1 is a length of flashing construction according to this invention, partially exploded;
FIG. 2 is a sectional view of the flashing in assembled condition taken on the line 2-2 of FIG. 1; and
FIG. 3 is a sectional view of an alternative flashing construction.
The flashing construction, according to this invention, is adapted for securement to the edge of a flat roof 10 and it comprises a seat, generally indicated by the numeral 12, for a cant 14. Seat 12 consists of a piece of sheet metal that is L-shaped in longitudinal cross section and has a base 15 secured to the edge of a roof deck by means of nails, as at 16 and a wall 18 that extends upwardly from the base 15. Slotted holes 17 are provided for nails 16 to allow for roof expansion/contraction. Triangular-shaped supports 20 maintain the base 15 and the wall 18 in L-shaped configuration.
The cant 14 is made from a fibrous insulating material or wood in sections that are adapted to fit between the supports 20. In the drawings, only a portion of a section of the seat member 12 is illustrated. In practice, the sections of seat member 12 are about 10 feet long and the brackets 20 are spaced apart 4 feet. The seat sections are laid, edge to edge, along the perimeter of the roof 10. Adjustable corner sections can be provided for the corners. The invention is not concerned with the building up of a series of seat members but with the flashing construction itself and the extension of the members into a group along the edge of a roof has not been illustrated in detail.
As indicated above, it is usual in the construction of a flat roof to first lay several layers of roofing felt. These layers of roofing felt are indicated in the drawings by the numerals 22, 23 and 24. Although three layers are shown, more layers are sometimes employed. Their edges are brought up over the cant 14 and, in order to secure a weatherproof joint at the edges, two layers of felt flashing 25 are provided reaching from above the cant 14 adjacent wall 18 to a short distance beyond base 15 on top of roofing felt 22. A flexible weatherproof flashing membrane 26 is secured along the upper edge of the wall 18 of the seat member 12, extending down over the felts as indicated. The roofing compound of pitch and gravel is then poured over the overlying weatherproof flashing membrane 26, flashing felts 25, and roofing felts 22, 23, 24, as shown at 29 in FIG. 2.
The flashing membrane 26 is gripped along one edge thereof between the jaws 28 and 30 of the clip member 32. Clip member 32, in use, secures the membrane to the upper edge of the wall 18 of the seat 12. It will be apparent that the seat 12, the cant sections and the weatherproof flashing membrane 26 can all be installed from roof level without the need for scaffolding by the roofing crew. There is no necessity for detailed fitting of a wooden cant member by a carpentry crew.
A facia assembly that consists of a vertical member 34 and a deck extension 36 fit onto the seat member, as indicated in FIG. 2, the vertical member slipping over clip 32 and wall 18 at the top, and the deck extension 36 being slipped into place from the end. Extension 36 is retained by lip 37 on facia 34 and lip 39 on wall 18.
FIG. 3 of the drawings shows an alternative flashing construction according to the invention. In this case, the seat is L-shaped and has a base 40 and a back 42. The base 40 is fastened at longitudinally spaced apart points to the corrugated metal deck 44 of a roof as at 46. Sheets of fibrous insulation 48 overlay the roof deck 44 and the base 40 of the seat. The cant 50 overlays the insulation 48 and, as before, is positively located in position by the wall 42 and its related base 40 of the L-shaped seat. Spaced apart brackets similar to brackets 20 of FIG. 1 are provided for rigidifying the seat construction.
Two layers of flashing asbestos felt 52 overlay the sheets of insulation 48 and a weather tight flexible flashing membrane 54 is secured to the upper edge of the wall 42 of the seat by means of a clamping arrangement similar to the one 32 shown in FIG. 1.
The facia in FIG. 3 comprises a bracket 56 fastened to the wall 42 and a clip on ornamental facia 58.
Embodiments of the flashing construction of this invention, other than the ones illustrated, will be apparent to those skilled in the art. The principle of the invention is to provide a flashing having a seat for a cant member that can be simply attached to a roof decking and that has means for securing a weatherproof flashing membrane.
Flat roofs are usually waterproofed by means of several layers of roofing felt overlaid with a mixture of pitch and gravel. It is usual to provide an upwardly sloping cant at the edges of the roof so that the roof, in effect, forms a basin. The cant must, of course, be flashed and means must be provided for making the flashing waterproof under all weather conditions. The roofing felts which underlie the pitch and gravel mixture terminate at the cant and special care must be taken to ensure that the termination of the felts is not open to weather and is not likely to become open to weather.
While there has been no serious difficulty in achieving a weathertight flashing construction at the edge of a flat roof in the past, it has been achieved only at considerable expense and inconvenience. The most usual method of constructing a roof flashing of this type involves the cooperation of at least the carpentry and the roofing trades and there is often difficulty in arranging for suitable time schedules. The carpenter will complete his work and the roofer is often not immediately available. This results in time lost in the building construction. Metal cant constructions, which do not require the cooperation of the carpentry trade, have been devised but they are complex and costly and have received little general acceptance. In addition to being complex and costly, they do not have the insulating value of the more solid fibrous cant construction.
This invention overcomes these disadvantages and provides a flashing construction for a flat roof that can be very simply applied and that does not require cooperation between carpentry and roofing trades in order to construct the roof flashing. The flashing is secure and waterproof and of good appearance. It is an improved flashing at a lesser cost.
Generally speaking, a flashing construction for a flat roof, according to this invention, comprises a seat for a cant, the seat having a base adapted for securement to a roof deck and a wall extending upwardly from the base, the base and wall being adapted to embrace a cant in an operative position. It has a flexible weatherproof flashing membrane and securing means along one edge of the membrane for securement to the wall of the seat adjacent the top thereof. The invention and its manner of use will be apparent after reading the following detailed specification, read in conjunction with the drawings.
In the drawings:
FIG. 1 is a length of flashing construction according to this invention, partially exploded;
FIG. 2 is a sectional view of the flashing in assembled condition taken on the line 2-2 of FIG. 1; and
FIG. 3 is a sectional view of an alternative flashing construction.
The flashing construction, according to this invention, is adapted for securement to the edge of a flat roof 10 and it comprises a seat, generally indicated by the numeral 12, for a cant 14. Seat 12 consists of a piece of sheet metal that is L-shaped in longitudinal cross section and has a base 15 secured to the edge of a roof deck by means of nails, as at 16 and a wall 18 that extends upwardly from the base 15. Slotted holes 17 are provided for nails 16 to allow for roof expansion/contraction. Triangular-shaped supports 20 maintain the base 15 and the wall 18 in L-shaped configuration.
The cant 14 is made from a fibrous insulating material or wood in sections that are adapted to fit between the supports 20. In the drawings, only a portion of a section of the seat member 12 is illustrated. In practice, the sections of seat member 12 are about 10 feet long and the brackets 20 are spaced apart 4 feet. The seat sections are laid, edge to edge, along the perimeter of the roof 10. Adjustable corner sections can be provided for the corners. The invention is not concerned with the building up of a series of seat members but with the flashing construction itself and the extension of the members into a group along the edge of a roof has not been illustrated in detail.
As indicated above, it is usual in the construction of a flat roof to first lay several layers of roofing felt. These layers of roofing felt are indicated in the drawings by the numerals 22, 23 and 24. Although three layers are shown, more layers are sometimes employed. Their edges are brought up over the cant 14 and, in order to secure a weatherproof joint at the edges, two layers of felt flashing 25 are provided reaching from above the cant 14 adjacent wall 18 to a short distance beyond base 15 on top of roofing felt 22. A flexible weatherproof flashing membrane 26 is secured along the upper edge of the wall 18 of the seat member 12, extending down over the felts as indicated. The roofing compound of pitch and gravel is then poured over the overlying weatherproof flashing membrane 26, flashing felts 25, and roofing felts 22, 23, 24, as shown at 29 in FIG. 2.
The flashing membrane 26 is gripped along one edge thereof between the jaws 28 and 30 of the clip member 32. Clip member 32, in use, secures the membrane to the upper edge of the wall 18 of the seat 12. It will be apparent that the seat 12, the cant sections and the weatherproof flashing membrane 26 can all be installed from roof level without the need for scaffolding by the roofing crew. There is no necessity for detailed fitting of a wooden cant member by a carpentry crew.
A facia assembly that consists of a vertical member 34 and a deck extension 36 fit onto the seat member, as indicated in FIG. 2, the vertical member slipping over clip 32 and wall 18 at the top, and the deck extension 36 being slipped into place from the end. Extension 36 is retained by lip 37 on facia 34 and lip 39 on wall 18.
FIG. 3 of the drawings shows an alternative flashing construction according to the invention. In this case, the seat is L-shaped and has a base 40 and a back 42. The base 40 is fastened at longitudinally spaced apart points to the corrugated metal deck 44 of a roof as at 46. Sheets of fibrous insulation 48 overlay the roof deck 44 and the base 40 of the seat. The cant 50 overlays the insulation 48 and, as before, is positively located in position by the wall 42 and its related base 40 of the L-shaped seat. Spaced apart brackets similar to brackets 20 of FIG. 1 are provided for rigidifying the seat construction.
Two layers of flashing asbestos felt 52 overlay the sheets of insulation 48 and a weather tight flexible flashing membrane 54 is secured to the upper edge of the wall 42 of the seat by means of a clamping arrangement similar to the one 32 shown in FIG. 1.
The facia in FIG. 3 comprises a bracket 56 fastened to the wall 42 and a clip on ornamental facia 58.
Embodiments of the flashing construction of this invention, other than the ones illustrated, will be apparent to those skilled in the art. The principle of the invention is to provide a flashing having a seat for a cant member that can be simply attached to a roof decking and that has means for securing a weatherproof flashing membrane.