bpatters69
Cadet
- Joined
- Jan 7, 2012
- Messages
- 11
Hello All,
I live on the Florida Intracoastal and I would like to install a Daivt on my seawall. I purchased the Davit which is rated for up to 1000 pounds. The boat that I will be hoisting is a 10' Avon which weighs about 250 pounds with the motor. The Davit is a manually cranked Davit and the base is flat with 4 holes for fasteners.
In my first attempt at installing the Davit, I drilled 4 holes into the seawall and dropped in 4 x 1/2" redhead fasteners. Two of the redheads tightened down nicely but the front two would not tighten down at all. After a bit more research, I found that redheads are not the right fastener to be using so I took a 5/8 bit and re-drilled each hole for a concrete lag shield so I could drop in a galvinized lag bolt. The galvinized bolts worked better but when I applied downward pressure, the bolts started to slip and the Davit tilted. Ugh. :banghead:
So back to the drawing board. I realize that when I removed the redheads and re-drilled the holes that the holes were probably too big for the lag shields which would not allow the sleeve to tighten down properly. I could just drill 4 new holes, drop in the sleeves and try to install the Davit again but I do not want to drill more holes in my seawall than are necessary. So my question is, am I on the right track? Should I be using a different type of fastener? The lag bolts were 6" long as more info and the sleeves were abobut 2'. Here is a link to the lag shield:
http://www.homedepot.com/h_d1/N-5yc...53&langId=-1&keyword=lag+shield&storeId=10051
My other thought is that the seawall is old and maybe the concrete is too brittle for attaching a Davit? The seawall is probably 30 years old or more.
Any comments and advice is greatly appreciated.
I live on the Florida Intracoastal and I would like to install a Daivt on my seawall. I purchased the Davit which is rated for up to 1000 pounds. The boat that I will be hoisting is a 10' Avon which weighs about 250 pounds with the motor. The Davit is a manually cranked Davit and the base is flat with 4 holes for fasteners.
In my first attempt at installing the Davit, I drilled 4 holes into the seawall and dropped in 4 x 1/2" redhead fasteners. Two of the redheads tightened down nicely but the front two would not tighten down at all. After a bit more research, I found that redheads are not the right fastener to be using so I took a 5/8 bit and re-drilled each hole for a concrete lag shield so I could drop in a galvinized lag bolt. The galvinized bolts worked better but when I applied downward pressure, the bolts started to slip and the Davit tilted. Ugh. :banghead:
So back to the drawing board. I realize that when I removed the redheads and re-drilled the holes that the holes were probably too big for the lag shields which would not allow the sleeve to tighten down properly. I could just drill 4 new holes, drop in the sleeves and try to install the Davit again but I do not want to drill more holes in my seawall than are necessary. So my question is, am I on the right track? Should I be using a different type of fastener? The lag bolts were 6" long as more info and the sleeves were abobut 2'. Here is a link to the lag shield:
http://www.homedepot.com/h_d1/N-5yc...53&langId=-1&keyword=lag+shield&storeId=10051
My other thought is that the seawall is old and maybe the concrete is too brittle for attaching a Davit? The seawall is probably 30 years old or more.
Any comments and advice is greatly appreciated.
