Reinforcing joist - drill to big

Hello,

My husband tries to reinforced some joists in a stripped small bathroom. Some parts were rotten due to years of leakage.
He plans to install new pieces of wood on each sides of the old joists and to attach the all thing with some coach bolts.

First joist: the drill bit is too small to pierce through the 3 pieces of wood (old joist and the 2 new supports). Husband does not have a longer drill bit. Is there a way to finish the hole another way or does husband have to wait tomorrow to visit Screwfix again!

Second joist: husband noticed that he won't be able to drill anything at all this time as his drill + the drill bit will be far to long and the space to insrt the drill will be too narrow. How are we going to install the coach bolts there? Is there a way? I am sure there is and you always have ideas on that website.

I am not sure that my explanations are very clear. Please see the pictures.

Thanks.
letty

lettywetty, good evening.

OK, it appears that the joist ends [the bit of the floor joist that actually went into the wall] was rotten and has been replaced ???

If so??? the end of the joist secured within the wall should be wrapped in a water proof Damp proof Material.

You could have cut the old damaged joists over the center of the dwarf wall, this could have given more stability? and easier to achieve??

The bolt shown in the images is not a coach bolt it appears to be a dome headed bolt? Coach bolts are generally a square head with a pointed screw, generally these things are fixed by drilling a pilot hole and then screwing the bolt home with a spanner or similar

Hello,
Ok for the damp proof material.
The cut over the center of the wall: did not do that because the new joist is not exactly of the same size than the old one, could not find that anywhere. So we thought we had to level the new one the way it shows on the picture.
Husband browsing internet to find a long drill bit and just saw a right angle drill attachment which should solve his problem.

Drill the new joists together on their own. Then offer them up to the old joists, mark then with a pencil and drill them on their own. If you’re having difficulties fitting the drill in between, maybe cut the shank down once you have drilled all the new joists to try and fit it in. And as far as I know, they are coach bolts you have. Ken is referring too coach screws.

Dog tooth washers between the joists may help too

lettywetty said:

we had to level the new one the way it shows on the picture.

Click to expand...

Really sorry, but a packer under the "new joist" where the new joist bridges the dwarf wall could have packed the new joist to the correct height, likewise a piece of slate in the wall socket will hold the new joist to correct level.

Been there and have a couple ot T Shirts

Hello @domdee,

Drilling the joists is a good idea. He will try that. Thank you.

KenGMac said:

Really sorry, but a packer under the "new joist" where the new joist bridges the dwarf wall could have packed the new joist to the correct height, likewise a piece of slate in the wall socket will hold the new joist to correct level.

Click to expand...

Thank you. He has the packers.