Insulation advice - single skin garage conversion

[Floordilemma]

Hi. I'm looking for some advice, as I'd like to do the work myself.

We have a single skin garage conversion, done years before we moved in. Its freezing (and hot in the summer).

I'd like to insulate the loft cavity, but the loft hatch is very small, approx 30-40cm square. I'd struggle to get up there, and not sure I'd get normal rolls of insulation up there anyway.
What can I use? Is there something I could spray in? Or do I just cut the rolls smaller and squeeze myself in there with the spiders? It's not a big space - I could maybe sit up in the middle, definitely not standing room.

Also the floor...it's raised, as the garage is street level but the flooring is house level. Not much, again maybe 30cm or so (it's been a while since the floor was up so I don't have exact measurements). What can I put down here to insulate? Can I use normal insulation boards or rolls, or will these get damp resting on the floor? If I need to raise them so they're not touching the floor, how would I do this?

Any advice appreciated. I'm sure it's probably not the most complicated job, but I want to do it well.

If you have enough room height you can use ceiling tiles, just screw them onto the ceiling. Or insulated plasterboard for a second ceiling, and then plaster - nicer looking than the tiles. Best job would be to take the current ceiling down and insulate between the joists from beneath. Alternatively, you could fit a larger hatch. For the floor, cheapest and easiest:just thick underlay and carpet?

My ceiling hatch it 35x 28 cm (old house).

I bought rolls of narrow insulation from B&Q, unrolled them and fed them up through the hatch on the diagonal.

Ds 10 was at the bottom of the ladder pushing it upwards and I had wriggled into the loft space to lay it in place. Team Mint joint effort. 😊 It worked a treat but not for anyone with claustrophobia.

We've not long had it plastered! Definitely don't want to pay that again.

Will definitely be getting underlay and carpet. Do you think that would be enough?

I'm going to have to stick my head up there aren't I, and see if I can do it.

I think it might be a similar size.
It's not a massive room, and the hatch is quite central. Maybe I'll be able to do it with just head and shoulders through....feed the insulation up and then stick my arms and head in and roll it out.

I'm not massively bothered by spiders usually. But the thought of putting my head in that little dark space and potentially having them crawling on my head is freaking me out!

It won't be as scary as you think! Get a working light and place it in the roof space and then bribe your child/nephew/neighbours kid to squeeze in and roll some insulation out😀or call ITV and ask them whether they would like to shoot a reality show with a disgraced mp at yours. Never ever use foam insulation, but I have seen people shoot out loose insulation (like small Styrofoam balls) into loftspaces to fill them up. No idea what that costs, though.

Oh, Google tells me you can hire a 'blower' for loose fill loft insulation from most local plant and tool hire yards. That sounds fun. You literally just need to push the blower ducting through your hatch and pump out insulation bits. You can order those at amazon or shop around.

That sounds perfect!

I think that's what we had in the actual loft before we had it insulated and boarded.

I'll look that up. Hopefully it's Affordable.

I've found this, which looks like it might work under the floor...as it wouldn't be touching the actual ground.

I'm not sure I fully understand the reflective stuff though. Does it reflect the cold out, or keep the heat in? Or both?