Muskoka Retreat: Why We Combined Cedar Shake and Standing-Seam Steel on One Roof

Key takeaways

• Hand-split cedar shakes on the main body of the home, standing-seam steel on the lower-slope covered porches.
• The hybrid wasn't aesthetic indulgence — it was engineering: cedar fails fast on shaded, low-slope surfaces.
• Cedar specced at 5/8 inch hand-split shakes on a fully ventilated nail base, not laid directly on solid deck.
• Steel was 24 gauge in a matte slate-grey finish, hidden-fastener standing seam.
• Expected lifespan: 40-50 years on the cedar with maintenance, 50+ on the steel.

Where cedar earns its keep — and where it fails

Cedar shakes are the most beautiful roof material that exists for cottage country — and the most punishing to specify badly. They're a natural product that breathes, which means they shed water by being able to dry between rains. Take that drying away and they rot.

Where cedar works:

• Steep slopes (8/12 pitch or greater) that shed water fast
• Sun-exposed surfaces that dry quickly after rain
• Properly ventilated roof assemblies (not laid on solid deck)

Where cedar fails:

• Shaded slopes where moss and algae take hold
• Low pitches that hold water against the shake
• Unventilated decks that trap moisture from below

The hybrid rule we use up north

On this Muskoka retreat, the main body of the house has a 9/12 pitch facing south and west — full sun exposure, fast drying, steep enough to shed everything that hits it. Textbook cedar territory.

The covered porches that wrap two sides of the house are a different story: 4/12 pitch, partially shaded by mature pines, and lower to the ground where humidity sits. Cedar there would have been moss-covered inside five years and rotting inside ten.

Our rule, refined over twenty-five years of cottage roofs: if a slope can't dry within 48 hours of a soaking rain, it's not a cedar surface. Match the material to the microclimate of each plane.

Hand-split shake details that matter

Not all cedar shakes are the same product. Three details we specced:

The battened substrate is the detail most contractors skip. Laying cedar on solid deck is faster and cheaper — and it kills the roof a decade early. The shakes need to breathe from below as well as above.

Standing-seam details that matter

Standing-seam steel is the right answer on a shaded low-slope porch, but it has its own failure modes if it's specced wrong:

• Gauge matters. We use 24 gauge minimum on cottage country roofs. 26 gauge is what bargain bids quote — it oil-cans (visible waviness) and dents under hail.
• Hidden fasteners only. Exposed-fastener steel uses screws through the face of the panel that work loose over freeze-thaw cycles. Standing-seam hides the fasteners under the rib.
• PVDF (Kynar) paint finish. Cheaper polyester paints fade in 10-15 years; Kynar holds colour for 30+.
• Snow retention engineered to plane. Steel sheds snow violently — we calculated and installed snow guards above the porch entries so a metre of snow didn't avalanche onto guests.

Cost and expected lifespan

Both materials cost significantly more than asphalt up front. The lifespan math is what justifies them:

For a property the owner intends to keep in the family, the lifecycle cost on cedar and steel beats asphalt — and the resale story is materially different.

What the owner has to do annually

Cedar isn't no-maintenance. Real talk for any owner considering it:

1. 01

   Annual debris clear in fall (pine needles in shake gaps trap moisture).

2. 02

   Visual inspection every spring for moss or lifted shakes.

3. 03

   Treatment every 5-7 years with a borate-based wood preservative (kills moss spores, slows UV greying).

4. 04

   No pressure washing — ever. It strips the surface lignin and dramatically shortens lifespan.

Steel maintenance is functionally zero — annual gutter clear and a visual look at panel fasteners. That's part of why the hybrid worked: the porches that get the most foot traffic and visibility also need the least maintenance.