Internal insulation

Think tank 1

Would anyone who has used insulated plasterboard to insulate the internal walls in there house. Just one question. Did it make a difference to the heat and comfort and is it worth it. PS. My house was built in the 60s. Just cavity blocks..

denismc

I'm considering this myself and the U-values for some of the products out there seem good.
Kingspan Kooltherm K118 has a U-value of 0.018 W/m·K , compare this to 150mm rockwool with 0.040W/mK then yes in theory you it should make a big improvement.
I have a bathroom that is already drylined but is still cold, so I am considering adding insulated plasterboard to improve things.

DublinDilbert

Yes recently done two external walls in an extension, difference is Day and night. Went for 100mm overall, very happy with the results.

listermint

Anyone who tells you it works 100% is wrong. It has to be taken into individual circumstances.

A holistic approach. For example your drylined wall could be easily defeated by bad glazing or poor attic insulation or poor ventilation.

There is no hard fast rule it differs for each house. Best to seek someone who can look at the overall.

Payton

Ive just refurbed my old family home, it was built in 1970 with feck all insulation. Its a terreced house so it was only front and back that had to be insulated. There is treble glazed windows in the house from a few years ago. The build of the house is strange the structure over the bottom window to the bottom of the top was a wooden frame with felt and wire mesh and a glance of insulation so i put earthwool into the frame and then 50mm insulated plasterboard and the house is extremely cozy even during the recent cold spell with the heating on for 60 mins in the evening so much so that the heat upstairs i have to lower the temputure on rads in the bedrooms.
All in with materials roughly and it was easy enough to do was E350 and a plasterer for a day and half E220 job well worth it.

Think tank 1

Hi. Where did you buy the materials and what mm was the plasterboard. Thanks.

Payton

Think tank 1 wrote: »

Hi. Where did you buy the materials and what mm was the plasterboard. Thanks.

I got them all from my local builders providers. Have a chat with them and tell them what your planing to do and they'll advise you. The plasterboard was 52mm (2 inch).

DublinDilbert

Think tank 1 wrote: »

Hi. Where did you buy the materials and what mm was the plasterboard. Thanks.

Most builder providers will deliver for about €20, well worth it when you consider the weight of the boards. For plaster b&q is normally the best value, one bag will cover 2.5 boards, approx.

dathi

denismc wrote: »

Kingspan Kooltherm K118 has a U-value of 0.018 W/m·K , compare this to 150mm rockwool with 0.040W/mK .

thats the thermal conductivity figure for the insulation's not the u value. u values are usually given for the entire wall build up . to get a u value for the wall you have to change the conductivity figures to resistance figures Resistance = thickness of insulation divided by W/mk you do that for all the layers eg. insulation plaster blocks etc when you have all those figures you add them together and divide them into 1 . that will get you a u value for the wall in W/m2k