Recent comments in /f/DIY

brock_lee t1_j9ym1e5 wrote

If the door is still sold, you can buy the unit and just replace the slider. Wasteful, but easy. Have you checked to see if the manufacturer just sells the doors without the frame? If the doors are older and were common in your area, you might be able to ask neighbors if anyone replaced one and still has the old one that's functional.

My doors are 42 years old, and when the rollers failed, I asked around on Nextdoor since these same doors were used in every house around here, but never heard from anyone. I finally managed to locate new replacement rollers after a long search.

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fredsam25 t1_j9yhqfd wrote

To calculate the shear strength of anything, look up the shear strength of the material: about 30 kpsi for carbon steel. Then multiply by the cross sectional area: M5=> ~4.1mm od = 0.161in od => 0.0205 in^2. So shear strength is 30,000 psi x 0.0205 in^2 = 610 lbs. Then divide by 4 for a safety factor. So place no more than 153 lbs per screw in shear.

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Guygan t1_j9yg03t wrote

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revtor t1_j9yc1yq wrote

You need more contact area between the anchors and wall material. So get longer anchors (longer equals more pull out resistance). Anchor can be anything really, a length of threaded rod works well if it’s thick enough and you use enough to support the load.

Also drill the hole a good bit bigger than the anchor bolt and use either regular concrete or good epoxy to set the anchor. You want the anchor to only be contacting the adhesive and the adhesive to unify with the spongy wall material. Another benefit of the larger hole is the ability to exactly level the anchor rods as the adhesive is setting.

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