2024: lodge roof replacement

[msimerson]

The current corrugated galvanized iron roof was installed in 1965. The material has a service life of 30-50 years. With some periodic maintenance (spray coated by Norm Vigus, nail coverings, fastener replacement), it has lasted years beyond its expected service life.

Every year we are now replacing fasteners as the winter snow and ice loading rips them out. Delaying the replacement of the roof will permit deterioration of the framing below the metal. It is preferable to replace the roof before extensive wood replacement beneath it is needed.

Plan

• tear off the existing roof layers (steel & cedar shakes)
  • save as much of the metal roofing as possible, for other out buildings.
  • using shingle strippers to remove shakes
• clean the roof framing members (presumed to be 2" rough sawn tongue and groove decking)
• cover the entire roof with a fully adhered waterproofing membrane (ex: grace ice and water shield)
• lay 2x4 furring across the roof at distance of the fastening pattern of the steel roofing.
• fill the gaps between the furring with 1-1/2" XPS or polyiso foam insulation
• cover the entire roof with standing seam steel roofing

We are adding some insulation on the roof, but nowhere near code minimum. The lodge is under-built for the snow load and we depend on heat loss through the roof to melt the snow off. The standing seam steel roofing with no exposed fasteners will be slipperier than the corrugated steel with a field of nail and screw heads sticking up.

Details

• Pantry roof: 33’ x 15’
• Length of lodge roof: ~90'