Wood Deck Vol. 39: Roof Assembly u2014 DIY Dad's Renovation Log

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ud83dudcda Wood Deck Build Log u2014 13 of 19

u2190 Build #38: Purlins u00b7 Series Index u00b7 Build #40: Floor Boarding Pt.1 u2192

u7acau30fbSee the complete Wood Deck DIY Guide

Originally published: 2020-11-11 / Revised: May 8, 2026

2026 Update from DIY Dad: Framework, Roof, and Floor Boarding Assembly

2026 Update from DIY Dad: Framework, Roof, and Floor Boarding Assembly

Most Important

ud83duded2 RECOMMENDED PRODUCTS

Pressure-Treated Deck Lumber

Pressure-treated lumber is the baseline u2014 skip it and you’ll be rebuilding in 5 years.

Amazon US u2192
Amazon Japan u2192

Once the foundation and framework are complete, it’s on to the roof assembly, then floor boarding. The shape starts to emerge and you get that feeling of “the end is finally near!”

Key Points for Polycarbonate Corrugated Roofing Installation

Secure adequate overlap (150u201400 mm or more)
Fix with dedicated screws (umbrella nails or poly-carb screws)
Seal ridge side and eave side (to prevent rainwater infiltration)
Rafter slope must be at least 1/50 (approx. 1.1 degrees)

If you’re sloppy with the edge treatment on the sheeting, it will lift in strong winds u2014check all edges after installation.

How to Lay Hardwood Decking

Pre-drilling is essential (drill 3 mm pilot holes)
Use dedicated stainless steel screws (iron screws cause rust and black staining)
Board spacing: 3u2014 mm (use spacers for consistency)
Trim the ends after all boards are laid u2014cut in one straight pass with a circular saw

Hardwood is very heavy u2014two-person work is the baseline.

Hi, DIY Dad here. Continuing the wood deck renovation series. Rafters and purlins are assembled u2014on to the next step! Time to install the roofing material. I’m using 7-foot polycarbonate corrugated sheeting. First, I temporarily place it on the joists.

u7acau30fbPolycarbonate 7-foot sheets u2014temporary placement

Fixing method: screw nails.

u7acau30fbScrew nails

Nail from one end, thinking ahead about where I need to move my body. The roof tucks under the house’s lower eave u2014to handle rain and wind infiltration u2014so the panels under the eave are temporarily slid downstream and the screw nails are driven, then the panels are shifted back. It’s quite a pain.

u7acau30fbRoof

First sheet done. Since the floor boards aren’t in yet, my footing is a sheet of plywood laid over the joists with a stepladder on top. Pretty wobbly and nerve-wracking. Keep installing sheets one by one.