External wall insulation

me4many

Hi folks

Can external wall insulation be used over pebbledash. My walls are 50/ 60 years old. The dash is absolutely solid onto the walls.

Thanks

Dudda

The easiest thing to do is plaster the walls first to create a smooth layer to fit the external insulation. It doesn't have to be absolutely perfectly smooth plastering once it's flat enough to fix the external insulation to. This is what I've done on buildings of similar age. Even hacking it off which will take ages won't give a smooth surface.

Purgative

When we had it done, we had awful thick pebble dash. When you painted it, you couldn't use a roller, you had to dab the paint in with a brush.

Anyway when the guys came, they just used extra adhesive and extra fixings. Been up six or seven years with no problem. Had a follow up visit from a guy from NUI Galway. He had one of these heat camera yokes, again no problem.

me4many

Thank you very much for that info..

I've got a small detached cottage 35' x 20' approx. Easy access..

Would you have any idea what it might cost. I will look into it in detail but nice to have some idea of price..

Thks again.

Purgative

No idea on the cost, I imagine its expensive. We had 3 guys (the boss, a plasterer, and an insulation bod) with us for about 10 days. It was summer and they were starting early and finishing late.

Have a look on the SEIA website. They do offer grants.

me4many

Thanks for that...I'll look up their site..A grant wild be handy for sure.

me4many

Planet X

All the info is on the SEAI site re:grants. For eg, the new grants have been upgraded. Semi detached house could avail of grants to €6k for external wall insulation.

Pebble dash wall is not a problem.

Jaymacc

If planning external wall insulation do not get the grant for cavity wall insulation beforehand as it means you will not get any grant towards your external wall insulation.

C. Eastwood

https://www.boards.ie/discussion/comment/119334332#Comment_119334332

If there is a Cavity, it will be ventilated, and if the cavity is not filled, the warm air heat loss from the inside of the house will escape up through the ventilated cavity by Convection.

Therefore it is axiomatic that the €€€€EWI will be redundant, if the cavity is not filled.

Warm Air will always choose to rise up by Convection rather than to travel through a structure by Conduction.

Try and explain this to your Insulating Certified Grant Expert.

If your wall is a Cavity Constructed wall without any Insulation, the U Value will be approx 2.1 watts/m.sq/degreeC/hr.

If the 50 mm cavity is filled with a good quality Insulation the U Value will be approx 0.5Watts/m.sq/degree/hr.

This will reduce the heat loss through the walls down to approx 1/4 of the present heat loss.

As we live in Ireland with a few days of approx zero degrees C, this is a good U Value.

sydthebeat

https://www.boards.ie/discussion/comment/119334332#Comment_119334332

agreed. SEAI will only grant fund one wall upgrade type ie pumped cavity OR External Wall Insulation

as C Eastwood says above, if applying for EWI grant, get the walls pumped beforehand

jimbobo

https://www.boards.ie/discussion/comment/119334332#Comment_119334332

Good advice.

We almost got stung with this when renovating our house recently. Luckily we spoke with a very knowledgable person at the SEAI and was given the correct advise so as to maximise our grants!