A lot of damage to URM buildings can be attributed to parapet failures when a seismic or wind event occurs. The damage can occur not only to the building itself, but to nearby buildings, walkways, and driveways which poses a major risk to life safety and can increase recovery time. Bracing the parapets is a must when evaluating the needed retrofitting of a URM building.
AT-XP® is a fast-cure, all-weather, high-strength anchoring adhesive and may be used to anchor threaded steel rods or deformed steel reinforcing bars in unreinforced masonry.
SET-XP® is a high-strength anchoring adhesive and may be used to anchor threaded steel rods or deformed steel reinforcing bars in unreinforced masonry.
Screen tubes are used in hollow base material applications to contain adhesive around the anchor and prevent it from running into voids.
Holdowns are often used to resist out of plane forces, tying the wall to the roof or floor assembly. The HTT5-3/4 holdown uses a 3/4" diameter anchor bolt, which is typically required when anchoring into URM.
Retrofit and bearing plates are often used in out of plane wall to roof or wall to floor anchorage conditions and utilize a larger bearing surface on the side of an unreinforced masonry wall.
Straps may be used to resist out of plane wall to roof or wall to floor anchorage forces or drag forces when installed on the top or bottom of roof or floor framing. One out of plane force-resisting solution uses the MSTD Marriage Strap, an overlapping in-line splice between an HTT tension tie and a CMSTC16 coiled strap.
Hand-drive or collated screws may be used to enhance wood diaphragm strength. Strong-Drive structural wood screws may be used for connector or steel to wood connections.