Make a Potting Bench with Concrete Countertop and Metal Roof

Rafters and Roofing

Rafters are laid over these beams and a birds mouth is marked.

Rafter to Beam Technique

Make a Potting Bench with a Cast Concrete Countertop and Galvanized Corrugated Metal Roof.
marking birds mouth on rafter over beam
Make a Potting Bench with a Cast Concrete Countertop and Galvanized Corrugated Metal Roof.
marking birds mouth on rafter over beam

These are cut on the workbench. I extend the vertical cut marks on some green painters tape.

Make a Potting Bench with a Cast Concrete Countertop and Galvanized Corrugated Metal Roof.
cutting birds mouth on rafter with circular saw

Then I make my first cuts with a circular saw. The circular saw is used first as it makes the cut square to the face. These cuts are then finished with the jig saw.

Make a Potting Bench with a Cast Concrete Countertop and Galvanized Corrugated Metal Roof.
cutting birds mouth on rafter with jigsaw

Finished Birds Mouth Rafter Cuts

Make a Potting Bench with a Cast Concrete Countertop and Galvanized Corrugated Metal Roof.
birds mouth cuts on rafter

Now to attach these to the beams.

Make a Potting Bench with a Cast Concrete Countertop and Galvanized Corrugated Metal Roof.
setting rafter on beams

I find it easier if the two end rafters are attached to the beams with a small angle bracket.

Attaching End Rafters with Angle Bracket

Make a Potting Bench with a Cast Concrete Countertop and Galvanized Corrugated Metal Roof.
attaching end rafters with metal brackets

The three middle rafters are attached by toe screwing. Over these rafters I laid three 1×6 boards as strapping for the metal roofing panels.

Make a Potting Bench with a Cast Concrete Countertop and Galvanized Corrugated Metal Roof.
toe screw rafters

I did measure corner to corner of the rafters to see if my roof was close to being square. This is an important step before the metal panels are installed.

Make a Potting Bench with a Cast Concrete Countertop and Galvanized Corrugated Metal Roof.
adding strapping boards over the rafters

If not then your overhangs will not be consistent along the rake or eave. I didn’t have to make any corrections with the strapping so I was lucky.

Ready for Corrugated Panels

Make a Potting Bench with a Cast Concrete Countertop and Galvanized Corrugated Metal Roof.
laying first roof panel on strapping

I use 4 foot galvanized corrugated panels for the roof. These are slid over the strapping, squared and spaced and temporarily clamped in place while I check my overhang before running in screws.


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