Flashing Plywood Siding

Don t nail through the flashing itself or it will eventually leak.

Flashing plywood siding.

The z flashing resembles the letter z from the side and comes in strips about 10 feet long. John latorre a contractor in tolumne california replies. Where a butt joint is necessary use a scarf joint sloped down toward the building s exterior. Slide the widest edge of a z flashing strip behind the upper siding panel.

Begin at either end of the wall and set the level middle section of the z flashing onto the top edge of the siding panel with the wider flange upward and against the wall framing. I m installing t 111 plywood siding on an outbuilding with several windows and doors. Adapted with permission from best practices guide to residential construction. The large leg of the metal goes against the wall leaving the seat and face covering the top edge of the siding.

When the upper part of the. T 111 is best installed over tar paper or housewrap stapled to studs. Galvanized z flashing so called because of its z shaped profile keeps water from getting through horizontal joints between sheets of plywood siding. Friday july 27 2018 although commonly called z flashing the z has squared corners and it could as easily have been named stair step flashing we see it most often used at the horizontal joint between two sheets of plywood exterior siding to provide protection from water seeping in at the opening.

You set flashing upon top edge of each piece of plywood over a fat bead of caulk and hold it in place with just heads of roofing nails driven into sheathing. Flush the end of the flashing length with the wall corner and secure the flashing to the framing with an 8d nail at each wall stud. How to install plywood siding in this case t1 11. Galvanized steel z flashing is made from 28 gauge galvanized steel.

If the siding was installed correctly you should see a piece of z metal flashing at the butt joint of the two pieces of siding. You set the flashing on the top edge of each piece of plywood on a fat bead of caulk and hold it in place with just the heads of roofing nails driven into the sheathing. With plywood sidings use a z flashing at horizontal joints to shed water to the outside see figure 1 13 at above left. Overlap the ends of the flashing by at least 2 inches and run a bead of caulk between the pieces at the overlap.

It is used to protect the horizontal joints between sheets of siding from water infiltration. A few tips and tricks to replace and install t1 11 plywood siding by yourself diy. Avoid horizontal butt joints in vertical siding. The best option for windows is the type with a vinyl.

The seat dimension 3 8 in corresponds to the siding thickness.