Cheapest attic insulation?

anon1

Hi,

What is the cheapest insulation for insulating above a first floor ceiling between joists?

What are the options?

Thanks,

TC

ircoha

glass fibre is prolly the cheapest, first between the joists and then across them.

Put 10" in if u can

Mellor

As much as possible, its will return the money on your heating bill.

anon1

Has anyone used icynene?
Area is 2300sq ft
Want to do 225mm between joists as there is a floor over that.

10-10-20

This may help...

Product Type Form mm €/m2

ISOVER Glass Wool Roll 200 €4.63
Knauf Combi Cut Glass Wool Roll 100 €2.55
Knauf Combi Cut Glass Wool Roll 170 €4.42
Moyplus Glass Wool Roll 150 €4.31
ISOVER Glass Wool Roll 260 €8.31
ISOVER Glass Wool Roll 100 €3.45
ISOVER Glass Wool, alu foil backed Roll 200 €6.93
ISOVER Glass Wool Roll 70 €3.44
Knauf Space Blanket Glass Wool, reflective plastic backing Roll 150 €9.08
ISOVER Glass Wool Roll 80 €7.47
Comfort Insulation Roll Sheep's wool Roll 140 €14.64
Comfort Insulation Roll Sheep's wool Roll 140 €14.64
Comfort Insulation Roll Sheep's wool Roll 100 €10.46
Comfort Insulation Roll Sheep's wool Roll 100 €10.46
Knauf Space Blanket Glass Wool, reflective plastic backing Roll 200 €22.38
Premium Insulation Roll Sheep's wool Roll 60 €8.80
Premium Insulation Roll Sheep's wool Roll 60 €8.80
Premium Insulation Roll Sheep's wool Roll 100 €14.67
Premium Insulation Roll Sheep's wool Roll 80 €11.74
Premium Insulation Roll Sheep's wool Roll 100 €14.67
Premium Insulation Roll Sheep's wool Roll 80 €11.74

Jablite Universal Insulation Polystyrene Board 25 €2.08
Jablite Universal Insulation Polystyrene Board 50 €4.25
Jablite Universal Insulation Polystyrene Board 100 €8.51
Jablite Universal Insulation Polystyrene Board 75 €6.39
Jablite Universal Insulation Polystyrene Board 25 €3.16
Jablite Universal Insulation Polystyrene Board 50 €6.34
Kingspan Thermaboard Urethane insulation Board 75 €16.16
Kingspan Thermaboard Urethane insulation Board 70 €15.08
Kingspan Thermaboard Urethane insulation Board 80 €17.24
Kingspan Thermaboard Urethane insulation Board 35 €8.62
Kingspan Thermaboard Urethane insulation Board 30 €7.75
Kingspan Thermaboard Urethane insulation Board 25 €7.11
Knauf Space Board Extruded Polystyrene Board 52.5 €15.52


Prices are from catalogs and various companies and should be considered estimations.

ircoha

anon1 wrote:

Has anyone used icynene?
Area is 2300sq ft
Want to do 225mm between joists as there is a floor over that.

Some 'Attic':eek:

Mellor

anon1 wrote:

Has anyone used icynene?
Area is 2300sq ft
Want to do 225mm between joists as there is a floor over that.

Thats a spray on foam right. It would gives a similar U-Value to stadard glass wool. How does it fair with cost? If you only have 225mm, i'd rather go for a higher spec glass wool to get the best u-value

jayceegoodmark

anybody know whats the best insulation for between rafters.
Is it necessary to leave ventilation space if using breathable felt.
Been told standard rolls of insulation used between rafters become inefficient.(shrinkage)
Anybody have experience with diy spraying?

ceekay74

Is it necessary to leave ventilation space if using breathable felt.



Basically, you need to leave a gap between the felt underneath the tile and the spray foam. This is done by fixing a breathable vent card to the rafters before spraying the foam.

Heres a thread i started not too long ago, it may be of some help...

http://www.boards.ie/vbulletin/showthread.php?t=2056807948

muffler

ceekay74 wrote: »

Heres a thread i started not too long ago, it may be of some help...

http://www.boards.ie/vbulletin/showthread.php?t=2056807948

Thats the idea...up to date.


@ jayceegoodmark - please dont drag up threads that are over 5 years old.