Should I rely on my strength to push the cement board flush with the studs while screwing, or should I trim the insulation for a better fit?
Asked by Erlend Føreland 
6 months ago
Last Updated: June 5, 2024
I’m about to install some cement board – when I’m screwing it in, do I just push on it to make sure it’s flush with the studs, or should I trim back some of the insulation first? Thanks in advance!
If you put too much pressure on that cement board, it’s likely to crack and cause the screws to pop out.
Hey , so do I need to trim the insulation a little and make sure the boards are even with the studs?
Hey , did you get insulation for a 2×4 wall? It shouldn’t protrude that much.
I prefer using Hardy backer, the material you have may warp and break. I only recommend using that for floors. Feel free to hang it however you want, but keep in mind that a wavy wall will require more effort to finish than a flat wall.
Hey , is this suitable for use in showers?
Hey , if you can handle a twisted path and still achieve smooth results, it might not be the easiest situation for a novice.
Is this actually happening? 😳
You should return the wonder board and opt for Hardie instead. It will push the insulation back into place and is a superior option for tiling.
Hey , I’m planning on installing shower panels here. I really should have looked into Hardie board before I got all that durarock and lugged it upstairs haha.
Maybe go with plywood first, then consider cement board?
Make sure to trim the insulation to fit properly within the framing. If the insulation is bulging out, it means you got the wrong thickness. Compressing the insulation will lower its R value.
Got it, . That was the only size of mineral wool in stock at the time.
Hey , you’ll need to trim or swap out all of that insulation. When insulation is compressed, it loses its ability to retain heat and becomes ineffective. Make sure it doesn’t fit too tightly inside the stud bay, or else it won’t be able to trap air in its gaps.
Remember to begin at the top and then work your way down when installing drywall or substrate
Okay, don’t judge me, but at first I thought the small hole in the wall looked like a figure in a dark robe walking on sand next to a flat mountain ⛰️ haha I don’t know 🤷♀️
Avoid compressing the insulation, it won’t work as intended. Seems like using 2×6 insulation in a 2×4 wall. You have three options: Trim the insulation to fit; Add 2×4’s to each stud (will still need to trim insulation); or replace with the correct thickness insulation
It’s best to get the right size insulation, the wrong one won’t work well
‘t forget to give it a good push
You might want to start cutting some 2×4 shims and align the old studs properly.
Hey, that’s definitely not insulation! I’m familiar with insulation and that’s not what it looks like. Contact us for some honest advice, free of charge!
It seems like is actually mineral wool.
Closed cell foam seals differently than does. If sprayed carefully, your concrete board on the studs won’t blow off.