Did you purchase bangers out the front of Bunnings

how does putting the projector higher up increase your picture size? why not just put it right below the joists so you get a more straight on picture? and presumably your projector is right above a couch anyway so is the additional 6 inches really going to save you anything at all?

Hilarious. You absolutely can and it’s carpentry 101. /r/DIY, you should be ashamed of yourselves for lying to OP.

OP, this is structural work and you should fully educate yourself on what can go wrong before attempting this but it’s not a big deal. Shore up the joist with a vertical 2x4 to prevent sag when you cut the joist and use hangers on the new header (joist than runs perpendicular). Sistering the adjacent joists is an option but not every case, that’s the only thing that would cost a bit.

https://codes.iccsafe.org/s/IRC2015/chapter-5-floors/IRC2015-Pt03-Ch05-SecR502.10

You would have to sister the floor joists on either side for the full run and then box frame it, so I wouldn't recommend that.

Yea anything is possible with time and money but you need to call a structural engineer

Crappy Tire has a set of half a dozen screws plus the bit for like $10

So to do this properly you will need to head out the joists which means where your blue marks are you would run a double floor joist from joist to joist and “heading” off the joist you want to notch you would then do the same thing on the other side creating your desired space for your projector. Everything would need joist hangers. I will add the fact that you are asking this question means that you should get someone who knows what they are doing to at the very least come look at this because I can tell you the proper way to frame this but there can be any number of reasons you shouldn’t do this and I have a single picture to go off.

This is how I’d do it. Where the shortened joist is And you have blue sketched in that blue should be a continuous piece with joist hangers at either and and at the middle to connect the shortened joist. Then I’d also drive some screws through the ends just because I have a box full in the garage.

But this is in no way professional advice and if you’re concerned have someone do calcs for you.

Oh, them words hurt my soul and are forbidden in my world.

I fully understand that this may not be a reasonable option.

Unless you have a huge room, I'd never build a home theater around a projector these days. I'd ditch the projector, even a medium quality LCD will provide better results than most home theater projectors. 86" LCDs are affordable and while you may sacrifice some size the viewing experience is going to be better.

If you stick with the projector don't notch the floor joist, lower the projector and screen if necessary.

BETWEEN your floor joists is far wiser.

No fam, you dont remove structural elements. You figure out a way to put the projector lower and deal with it.

Don't touch anything structural, especially doing it yourself. You can have someone come out and figure out a way to resupport around that joist, but at that point you'll be spending enough money where you may as well just buy a laser TV. Those are much higher quality than a projector anyhow.

In fact this would be a great way to justify buying one to your SO.

Terrible idea. Get a mount and mount it. There will be settings to adjust focus, keystone etc.(even if you have to mount upside down).

Don't mess with load bearing joists for a pet project.

Open air cinema!

Lol

Would consult a se but yes it’s probably going to be headed off with sisters each side

No, as others have said. Here's another reason why not. Up in a mostly enclosed box, your projector might not have proper ventilation and might overheat.

That could cause severe damage to the house without a structural engineer and probably a very expensive contractor. Are you finishing the ceiling as part of this project? If so, it might be short-sited to do this for a extreme short throw projector. If not, I would consider whatever you have temporary since you might want to redo the space in the future to be “finished”.

I would recommend either putting the short throw on a small cabinet underneath the screen, getting a slightly smaller screen, or looking at a standard throw projector swap. All of those would be cheaper than hiring a structural engineer to facilitate moving ceiling joists.

Are you willing to put columns on either side of the projector? If so, you could try running a single cross brace where you have blue lines, put columns on either side, then tie the cut end into that.

Thanks, I'll investigate those.

Always call the landlord, it’s his property.

At least not as a DIY.

An actual structural engineer could probably map the loading out and come up with a plan including metal I beams and all sorts of other expensive stuff… $40k later, OP can recess the projector.

Yes a 12 mm should work. It may not hold quite as tight but should work fine. Make sure to fill the hole with silicone sealant so everything is watertight after install.

I 100% do not recommend drilling into your bricks or the mortar. This is permanently damaging your house and personally I don't feel worth it for a hose reel.

I mean, technically he's right. If it truely were simply a 15/32" conversion it would have worked out to roughly 11.9mm.

Either they converted it wrong, or it wasn't originally 15/32"

Otherwise they would have stated 11.9mm instead of 11.7mm