In our next project, we face a fascinating challenge. This mid-century modern house features visible roof framing inside, with large roof rafters spaced 4 feet apart. These rafters aren’t decorative; they are structurally supporting the roof. Above these rafters, T1-11 siding, typically used for exteriors, serves as an attractive ceiling.

The roof itself is an older TPO (Thermoplastic Olefin) membrane that is currently leaking. You might wonder where the insulation is in this setup. Typically, insulation is placed between the roof rafters, but since these rafters are exposed, that’s not possible here. Instead, the insulation is situated above the T1-11 plywood and then covered by the roofing material. There is no plywood between the insulation and the roofing membrane.

Adding to the complexity, the homeowner wishes to install solar panels on the roof. Solar panels generally require rafters spaced 24 inches apart or less for proper installation. Reframing the roof isn’t part of our plan. So, what’s the solution?

Stay tuned as we tackle this unique roofing and solar panel installation challenge!