Originally Posted by creativepart
Ed, I like this conceptů but wonder about it being too secure. .
You are correct that the roof to frame joint must have some flexibility in order to avoid non elastic deformation of the roof material.
I want to clarify that I have not conducted an engineering analysis of the problem, so the following is a high-level analysis of the proposed approach.
The screen door beading is approximately 1/10 of an inch wide and is not adhered to either surface. As a result, it will introduce virtually no rigidity into the system and will only cause a very small decrease in the radius. It is important to avoid using a material that is too rigid to fill this space, as it could lead to problems. By using a flexible material and introducing a 1/10-inch gap, a larger volume is created over which the material can flex in shear. Speculatively, assuming the adhesion has not failed, this larger volume would provide greater flexibility compared to a very thin layer of tightly adhered material.
Perforating the edge of the roof is a particularly poor idea because it creates opportunities for stress concentration at the edges, which could result in cracks. Additionally, using fasteners in these holes could make the assembly too inflexible.
Please note that while this analysis offers a preliminary understanding of the situation, conducting a comprehensive engineering analysis would provide more accurate and comprehensive insights.