insulation for 9 inch cavity blocks

teflon

I need help guys....
I have a bathroom extension to the rear of my house in Dublin approx 10 ft X 10 ft. It is built with 9 inch cavity blocks and I was wondering of that could be insulated in ANY way? Its very cold even with the heating on and there seems to be a mould problem developing now because the hot air is hitting the cold walls and causing moisture. I installed one of the extraction fans and they dont seem to take much away!! I have left windows open but after I shower in the morning and head off to work I have to close the window. The whole bathroom smells damp now. I thought about dry lining but the bathroom is so small that I dont want it to become any smaller (unless thats my ONLY option)

Any recommendations PLEASE????? Any help GREATLY appreciated!!

sinnerboy

dry line using kingspan / quinn / xtratherm composite plaster board

that is the simplest option

teflon

how thick are they? Will I loose much of my bathroom? Every mm counts!!

sinnerboy

slimmest board is 37 mm - 25mm ins + 12mm pb . not great u value but far better than you got now

teflon

Id be losing a fair bit of the bathroom. Also I can only do it on one exterior wall as the bath buts right up to the plasterboard now and when I put tiles on the plasterboard it brought it right out near the taps on the bath...
what about foil backed plasterboard? Would I be wasting my time only doing 1 wall?
Design is as follows;
1 wall with window (this is the one i propose to dryline) the other wall is 1/2 covered by a small brick shead (shares the wall) and the other wall is connected to next door

ircoha

TBH a 10 by 10, i assume internal dims, is a biggish BR.

If I were u, and the cost of heating it is bothering you I would insulate all 3 wall: yes remove the bath etc and dryline all walls with at least 2 inches of insulation.
There are plenlty postes here with details on what do do and they will tell u why doing on wall is AWOT. start here http://www.boards.ie/vbulletin/showthread.php?t=2055176531

Also consider ceiling: is it insulated? what is floor made of?

muffler

ircoha wrote: »

TBH a 10 by 10, i assume internal dims, is a biggish BR.

If I were u, and the cost of heating it is bothering you I would insulate all 3 wall: yes remove the bath etc and dryline all walls with at least 2 inches of insulation.
There are plenlty postes here with details on what do do and they will tell u why doing on wall is AWOT. start here http://www.boards.ie/vbulletin/showthread.php?t=2055176531

Also consider ceiling: is it insulated? what is floor made of?

ircoha, just a gentle reminder that you are breaking the charter by putting text within a quote. I will let it go this time.

bbam

hi
With the dry lining you will loose about 6 inches each way in the bathroom. I'd prefer a 9'6 bathroom that I could bare to be in rather than a 10'0 bathroom that I couldnt be in with the cold..
cheers
bam

Mellor

bbam wrote: »

hi
With the dry lining you will loose about 6 inches each way in the bathroom. I'd prefer a 9'6 bathroom that I could bare to be in rather than a 10'0 bathroom that I couldnt be in with the cold..
cheers
bam

Well, only three walls will be drylined so you'll only lose 3 inches in one direction, its a tiny amount of the whole room.

teflon

right, measured the bathroom last night and I was WAY out. Its 5.5 ft X 6.5 ft. If I do get it drylined It will be so small that when I bend over I'll put me ass through the wall... Would dab/slabbing normal plasterboard not be sufficient or would that be just wasting my time?

I have to get rid of the bath now because it just barely fits in now and If I were to put anything else on the walls it would come over the bath!! Its so annoying as the rest of the house is perfect now...:(

muffler

teflon wrote: »

It will be so small that when I bend over I'll put me ass through the wall...

Problem solved - get rid of the toilet bowl

Sorry, its one of those mornings

teflon

or get a bigger toilet bowl and get rid of the bath.....:eek:

bbam

Why not throw out the bath and have only a shower??. This would free up space and even with dry lining the bathroom would be a reasonable size. I still feel that the loss in room size is minimal and would be well worth it for the gain in comfort..
Cheers..
bam

teflon

Well we like a bath every now and then so Id hate to get rid of it completely. We did see a smaller bath at the weekend thats about 1500 mm so that should fit in after the insulation has been added. That seems my only option. My father in law
was saying last night that he got insulation for one of their rooms that was just plaster board with insulation on the back and was about €30 a sheet and in total was about 1.5 inches thick. Would that stuff help me at all? he's going to get me a sample to look at today..

archtech

Did you consider putting insulation on the exterior side of the walls?

muffler

archtech wrote: »

Did you consider putting insulation on the exterior side of the walls?

See post #5

Jimbo

Post #5 refers to putting insulation on the interior side of the walls. Arch is talking bout insualtion to the exterior.

BTW, how would you do that? Composite panels or somthing?

muffler

jimbo78 wrote: »

Post #5 refers to putting insulation on the interior side of the walls. Arch is talking bout insualtion to the exterior.

BTW, how would you do that? Composite panels or somthing?

Yeah my mistake - I skipped through the post and seen he referred to an exterior wall but not the exterior of it if that makes sense

Jimbo

ill let it go this time lad

archtech

jimbo78 wrote: »

BTW, how would you do that? Composite panels or somthing?

You can find details of a system here. At the moment this is the only one that has an Agrément Certificate, however I understand that others may be on the way. I have to say that I haven't any experience of using it yet, we are looking at using it on a refurbishment job. For it to be successful the detailing at windows, doors and junctions would be critical. Properly done, i would say that it should be as good as any other form of insulation available and will possibly be the only way that the 9" cavity block can survive, in the construction of external walls in years to come, when the thermal performance requirements are further improved.

Mellor

External insulation won't work as it wouldn't complete the insulation. it would be some improvment, but the cavity blocks are connected to the cold external leaf. to solve this you would have to chase out some of the external leaf to complete the insulation.

ircoha

teflon wrote: »

Id be losing a fair bit of the bathroom. Also I can only do it on one exterior wall as the bath buts right up to the plasterboard now and when I put tiles on the plasterboard it brought it right out near the taps on the bath...
what about foil backed plasterboard? Would I be wasting my time only doing 1 wall?
Design is as follows;
1 wall with window (this is the one i propose to dryline) the other wall is 1/2 covered by a small brick shead (shares the wall) and the other wall is connected to next door

This is post 5 by the OP which suggests that he really only has access to the back wall, so as already pointed out Ext wont work.

teflon

Guys I had a builder out Monday and I have decided to get 1.5 - 2 inch internal insulated plasterboard on all the walls inside and the ceiling (which is insulated anyway) I also ordered a smaller slipper bath from a place in the Uk so hopefully it will be here before Xmas and I will have it finished before then. The builder was saying that with that insulation and a bigger Rad it should solve my cold problem. I mentioned to him about the suggestions here of bigger insulation on the walls and he said that 2 inch should be enough and that there is a tendancy these days to go overboard.

I hope it works out.....thanks for the posts guys

teflon

teflon wrote: »

I mentioned to him about the suggestions here of bigger insulation on the walls and he said that 2 inch should be enough and that there is a tendancy these days to go overboard.

It all comes down to deciding what is more important to you; cheaper insulation or lower fuel bills in the future.

archtech

Deleted User wrote: »

It all comes down to deciding what is more important to you; cheaper insulation or lower fuel bills in the future.

Totally agree