Roof construction out of insulation panels, any experience

Ray Palmer · 30-04-2025 04:15PM #1

I currently have a concrete roof garage and want to remove it. The main reason is I just can't seal it. When it rain the concrete gets soaked on the neighbour side and just seeps through the concrete. He added a bitumen coat as we did but it just doesn't stop it. Added liquid sealant on top which stopped a lot more but then during heavy rain it comes through

Either way I have decided I am sick of trying to fix it and just take it down. What I am thinking of doing is moving the stairs into the garage and breaking through the old external wall. To put in the roof over the old garage and I was thinking of using insulated roof panels as below.

https://www.panelsell.ie/insulated-panels-stock-articles#productelement-2

Few questions:

Do they provide enough insulation for a house?
How are they at noise insulation? Will rain sound very loud?
There are also transparent ones which I think would be nice directly over the new stairs. Are they much worse?
I am assuming I can make the porch out of the same material?
Do planners like or dislike such things?

drawing are not to scale just to give an idea

Calahonda52 · 30-04-2025 08:23PM

Drawings impossible to follow but sounds like a lot of expense to say proof, what about a raised/standing seam zinc roof on garage

Ray Palmer · 30-04-2025 11:39PM

https://www.boards.ie/discussion/comment/123405805#Comment_123405805

the last one is a side view. Sorry just using paint at the moment. If zinc roof is cheaper I am all for it and probably prefer it if more design choice

Gumbo · 01-05-2025 11:33AM

Aware of Planning requirements yes?

Following that, CN through the BCMS and Building Regulations and CPR.

Its a domestic extension so you have Part L, Part D etc to comply with.

Will these panels comply?

Ray Palmer · 01-05-2025 12:17PM

https://www.boards.ie/discussion/comment/123407521#Comment_123407521

I am pretty sure they comply but not certain. They are fire resistant. I think the insulation value is better than a standard roof or wall. The transparent panels seem to be better than triple glazing from what I have seen, which is good if you want light and not bother about a view.

If zinc roof is cheaper or the same I would like that, slightly more expensive works too. I thought this option would be cheaper and quicker. I am a bit concerned about noise as planes fly over.

Gumbo · 01-05-2025 12:44PM

https://www.boards.ie/discussion/comment/123407671#Comment_123407671

At least you e looked at that side then.
Just remember the whole garage is now internal so building regs apply. Insulation in the floor, walls etc

The existing garage walls may need to come down from a structural point of view and depending on their current conditions and signing off on the structure.

Ray Palmer · 01-05-2025 01:03PM

https://www.boards.ie/discussion/comment/123407754#Comment_123407754

I was aware of that but the garage wall is shared with the neighbour's garage so I doubt I will be taking that down but would be adding insulation and a waterproof membrane on the wall. The house has external insulation already so will need to tie the roof through the existing insulation to the wall and have flashing there. Was planning on retro fitting under floor heating in the property but I am hearing mixed responses to that. Will be ripping up the floor in the kitchen and relaying it as there is no insulation there and it is uneven and very bouncy. Whether I lay a new concrete floor or a new suspended floor is under debate.

The existing walls have a concrete roof on them so removing that and a new lighter roof should be OK from my understanding. Such panels are also structurally strong from my understanding. It may just be cheaper to use more traditional methods. Planing for next summer as I have to do proper plans and get planning permission

Roof construction out of insulation panels, any experience

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