Installing a chin-up bar on a wall (single drywall, osb + wooden stud)

[fredl]

Now I humbly ask the forum for advice before I further damage the wall in the home gym. It looks like a piece of Swiss cheese.

I bought a chin-up bar at XXL that attaches with three screws on each side. The C-C measurement is 590 mm.

https://www.xxl.se/pure2improve-chin-up-bar-large/p/1156012_1_style

I have an old wooden frame wall that is built with OSB + drywall. It's an exterior wall with paneling, so I have looked at where the nails are on the outside and measured on the inside.

However, I can't get it right. I suspect the C-C measurement between the studs (I don't know where they start and end since the nail can be anywhere on the stud). I've tried drilling, but it feels like I'm getting "false positive" signals because it's not taking properly. I also have a Bosch green stud detector that gives a clear signal but it's not working well there either.

What should I do? Buy an OSB or plywood and attach it, then paint it? What screws should I buy? The largest I have at home are 6x80 from ESSVE but they don't seem to hold properly either.

In desperation, I used screws from ESSVE facade plug which are like 8x120 but their heads became rounded...

 

[mhugo]

Hi,

Molly and osb work okay if you don't weigh too much, but I would probably choose plyfa myself.

 

[fredl]

Thanks for the answer. Went to Byggmax and bought construction plywood 15mm and cut a piece measuring 900x620 mm. I plan to attach this to the studs. The question is what to use to attach the brackets to all of this. The thickness will be just over 40 mm plus the material in the bracket and washers, etc. Should I have taken a French wood screw 50 mm long that is threaded all the way so it grips both the plywood and the OSB? Missed buying ones that short. I bought 90mm ones if I find studs anyway, but they aren't threaded to grip the plywood (and the drywall). Might have to take another trip

 

[Dan_Johansson]

Avoid French screw...

 

[fredl]

Avoid French wood screw...

Why?

 

[Dan_Johansson]

Why?

Because they are lousy?

 

[Fotografen]

French wood screw works well in solid wood, in 15 plyfa it's so-so...
If you find the studs in the wall, I would have attached two 2"4 between three studs, and then mounted it right over the middle one. In this case with a French screw of suitable length.

 

[fredl]

Now the contraption is in place. The French wood screw held incredibly well in the wooden frame and with a square washer, it sits as firm as a rock. However, one bracket had to be attached with a plasterboard anchor from Fischer. It didn't specify how tight to fasten them, so I didn't over-tighten them. If anything loosens, it will be that bracket. According to the specs, they can withstand 71 kg each, so with three of them...

I pre-drilled and countersunk all the screws I used to attach the plywood to the frames.

It could probably have been done better, but I'm satisfied with the appearance and feel.

 

[tomasjo]

Fun to see how it turned out on site! A question, why wasn't it enough to just use wood screws in the OSB+gypsum? The load capacity is said to be over 260 kg per screw according to the attached graphic. I'm asking because I would like to mount a similar bar but thought I didn't need to place the screws in studs

 

[fredl]

Fun to see how it turned out on site! One question, why wasn't it enough to just put wood screws in the OSB+plasterboard? The load-bearing capacity is said to be over 260 kg per screw according to the attached graphic. I'm asking because I'd like to mount a similar bar but thought I didn't need to put the screws in studs

Don't know. Maybe didn't manage to get the right dimensions on the screw + pre-drilling. It wasn't stable enough with just wood screws in the panels.