AHJ Engineering Evaluation, June 18, 2007 Report provided by Idaho Heritage Trust Technical Assistance funding
The deterioration is mostly in the architectural fabric, the roof shakes, soffit boards, fascia board, brick cracking and mortar. The structural members do not show any abnormal deterioration other than their age. The major structural issues are the main beam that is over stressed in bending under full dead and snow loads and the cracking of the masonry columns at the concrete benches.
It is our opinion that if this structure is left unattended the deterioration will continue to expand at a more rapid rate. Due to the uncertain nature of the prediction of a structural member failure; the structure should be cordoned off until repairs are made. To preserve this meaningful structure, mitigation of the environmental effects on the structure needs to happen. This can only be completed by reconstruction or reconstitution, replacing with like kind the exterior fabric, to seal the structure from the effects of the environment.
The following are our recommendations for restoration of "The Hat". Since not all members and connections could be observed for this assessment we also recommend that during the time of reconstruction improvement, a more complete inspection be performed.
- Replace the roofing with a new shake roof to match the existing Replace any roof skip sheathing that shows deterioration
- Replace any damaged ceiling boards with like kind, some of the existing boards that are not broken or rotten may be reused
- Replace the fascia board and fascia 2x4 and align
- Reinforce the main beam with a continuous 1-3/4” x 9-1/2” L VL sandwiched to the existing beam with glue and nails
- Add tie straps and clips where there are tension forces that need to be resisted Separate the concrete benches from the brick columns with isolation joint Repair the brick columns by repointing the joints and replacing all damaged bricks
- Replace existing concrete slab around and under the shelter, placing it on a compacted sub-grade and create positive drainage away from the four columns