How To Install Corrugated Plastic Roofing Under A Deck

Cut to fit pitch of roof and around vent.

How to install corrugated plastic roofing under a deck.

Next pre drill holes on the end and side ridges of the panels spacing the holes 6 to 8 inches apart. Lower than the purlin along the house 12 x 1 4 3. It s also suitable for awnings carports ga. How to install polycarbonate roofing available from www sunnyside co nz this shows an installation on a pergola.

If the span under your deck is 12 ft for example the purlin at the outer end of the deck should be 3 in. Overlap roof panels one corrugation away from prevailing wind and nail to rafters starting from one end. Use washered wood screws to secure the panel driving a screw every foot along each row. Then stretch a string between them.

Per foot of slope away from the house preferably 1 4 in. Beginning at the outside edge of your roof place each panel directly onto the purlins that are attached to the roof trusses. Adjust door construction to desired size. Install vent as close to roof peak as possible.

In one case i fastened the corrugated plastic roofing to strapping nailed perpendicular to the joists above using tapered spacers to create slope. If you ve got a pergola attached to your house then you might want to give yourself some extra shelter and protection from the weather simply by installing. Have an assistant hold the first corrugated panel in place against the rows of 2 by 4s on the upwind house side of the deck. Attach the moldings using galvanized nails to prevent rusting in case of any leaks.

For good drainage you want a minimum of 1 8 in. For a secure and attractive finish you should use molding strips on top of the rafters. Install the purlin along the house and the outer purlin. Use the rounded molding strips on the vertical rafters and the corrugated ones on the horizontal cross braces.