Mushroom fixings keep bending!

GreeBo

Hey all,

Very frustrated here, I'm dry lining some external walls and in some of the rooms which seem to be 9" cavity the metal mushrooms keep bending when halfway in.
They are 8 X 140 as it's 50mm board.

Any advice?

I'm using a brand new 8mm sds bit and clearing the hole...

Argh!

GreeBo

I'm thinking of just buying some 110s?

Triboro

Drilling deep enough?

GreeBo

Yeah, it's a 210 drill bit and is getting into the cavity.

On a hunch I used a vice grips to pinch the last inch of them, haven't had a problem since and they are holding firm.

Useful tip if the same happens to anyone else, removing the bent ones is a royal pain in the ass.

listermint

The way these are manufactured they are not necessarily all going to suit your drillbit, in the main the should but not all. Make sure to clean the drillhole out of dust and debris by moving the drill in and out a few times when done, if you've a hoover near by thats best for clearing the hole.

And simply decent cracks of a decent hammer should do it. Dont half arse it tappy tappy.

GreeBo

listermint wrote: »

The way these are manufactured they are not necessarily all going to suit your drillbit, in the main the should but not all. Make sure to clean the drillhole out of dust and debris by moving the drill in and out a few times when done, if you've a hoover near by thats best for clearing the hole.

And simply decent cracks of a decent hammer should do it. Dont half arse it tappy tappy.

Yeah I'm half thinking the problem is that the tip of the drill bit is too narrow, it takes a lot of force to get them in, much more than I've experienced before and they are impossible to get back out, I've had to cut them out with a hacksaw.

I might try another 8mm bit, but it's 300mm so a bit unwieldy to use.

Crimping the ends with a visegrips seems to be working for now anyway and is easier than trimming them all!

A lot of hole patching in my future though, about 10 of the feckers had to be removed and it's not pretty!

the_pen_turner

what brand bit is it . i have a few that create a tighter hole. the ones with the 4 tips seem to work better. .

how did you get on with the plasterboard lift

GreeBo

the_pen_turner wrote: »

what brand bit is it . i have a few that create a tighter hole. the ones with the 4 tips seem to work better. .

how did you get on with the plasterboard lift

Yeah my longer one has 4, newer one only has 2.

The lift is a life saver, job would be impossible without it, 50mm pir backed and 9ft ceilings. Can get a full 8x4 board on the ceiling by myself. I think the standalone struts would have been useless, wouldn't fancy going up the ladder with those boards on my head.

the_pen_turner

GreeBo wrote: »

Yeah my longer one has 4, newer one only has 2.

The lift is a life saver, job would be impossible without it, 50mm pir backed and 9ft ceilings. Can get a full 8x4 board on the ceiling by myself. I think the standalone struts would have been useless, wouldn't fancy going up the ladder with those boards on my head.

just got one myself , not used it yet

ShamNNspace

On another point I only use the plastic ones, I found the metal ones were drawing in dampness ... Clean out the holes well and give them a good accurate crack of the hammer