Insulation

St_Bernard

Hi

I’m renovating an old house and decided to go with the high pitched ceilings. Insulation never dawned on me at the time but looking at it now, I’m going to need a lot. After renting a cottage for the last 3 years that was more like a fridge than a house, I realise the importance of insulating properly.

Budget is pretty tight but want a well insulated house when I’m finished. I’m guessing the Kingspan stuff below is good but not cheap?

Kingspan Kooltherm K18 Insulated Dry–lining Board and Kingspan Kooltherm K7 Pitched Roof Board

Also thinking of Warmcel Cellulose Insulation, it’s recycled paper, thinking it might be more cost effective?

Any info or or experiences would be great

thanks

RKQ

St_Bernard wrote: »

Hi
Insulation never dawned on me at the time but looking at it now, I’m going to need a lot.

Ideally IMO insulation, airtightness & BER would be decided at the Design Stage. Insulation of walls, floor & roof needs to be looked at as a whole.

Kingspan or similar board between & under the rafters would work well. I notice you used a breathable felt on the roof. IMO from experience 50mm & 25mm thick boards are easier to cut than 100mm thick boards.

High ceilings are fine but remember heat rises, so insulute under the ridge board too & consider installing a fan to blow hot air down in winter.

The more attention you spend sealing the junction between the roof & the wall, the better. If you can "airtight" seal this junction you will save money over the life of the building. See manufacturers details & Dept of Envirnoment website for further info and construction details.

BryanF

St_Bernard wrote: »

Hi

I’m renovating an old house and decided to go with the high pitched ceilings. Insulation never dawned on me at the time but looking at it now, I’m going to need a lot. After renting a cottage for the last 3 years that was more like a fridge than a house, I realise the importance of insulating properly.

Budget is pretty tight but want a well insulated house when I’m finished. I’m guessing the Kingspan stuff below is good but not cheap?

Kingspan Kooltherm K18 Insulated Dry–lining Board and Kingspan Kooltherm K7 Pitched Roof Board

Also thinking of Warmcel Cellulose Insulation, it’s recycled paper, thinking it might be more cost effective?

Any info or or experiences would be great

thanks

St_B
+1 with what RKQ said, particularly get advice from a BER assesor and really and arch tech asap
may i suggest you do some reading instead of getting advice on just your roof insulation issue (particularly get advice from a BER assesor and really and arch tech to tell you the spec you a required to achieve asap), BUT start by buying this:
http://www.adverts.ie/non-fiction/homebond-house-building-manual-6th-edition/595829
also see: http://www.environ.ie/en/Publications/DevelopmentandHousing/BuildingStandards/FileDownLoad,19069,en.pdf
and really of all these http://www.environ.ie/en/TGD/#Part%20L%20Supplementary%20Documents
and definitely read this http://www.passivehouseacademy.com/downloads/Retrofit-Passive-House-Guidlines.pdf