Cavity wall pumped insulation

Nealmeehan · 23-10-2018 10:31AM #1

Hi just a quick question.is it worth my while pumping the cavity of my house. I already have 60mm in it and a 38 mm insulated slab on all the internal walls would it make any difference to heating costs or would it be just a waste of money

sydthebeat · 23-10-2018 02:02PM

yes it would make a difference, as long as its not a brick house near the coast

Nealmeehan · 23-10-2018 02:19PM

Thanks just not sure if it is worth doing it or not

MicktheMan · 24-10-2018 10:57PM

OP, based on the information you give, I would say that in all likelihood it will have little if any impact and be a waste of money.

neddynasty · 05-11-2018 12:57PM

Jumping on this thread rather than opening a new one.

My house has 40mm high density insulation in the cavity with a further 60mm that could be filled. I don't have insulated plasterboard in the internal walls. House built in 2005. It's not particularly drafty or anything and heats up quick enough. Probably could hold the heat longer.
In my setup would pumping the cavity with the silver bead insulation have an impact on heat retention?

MicktheMan · 05-11-2018 06:25PM

neddynasty wrote: »

Jumping on this thread rather than opening a new one.

My house has 40mm high density insulation in the cavity with a further 60mm that could be filled. I don't have insulated plasterboard in the internal walls. House built in 2005. It's not particularly drafty or anything and heats up quick enough. Probably could hold the heat longer.
In my setup would pumping the cavity with the silver bead insulation have an impact on heat retention?

Impact? yes; how much of an impact? who knows; Why? Insulation affects conductive heat loss mainly whereas most Irish houses suffer convective heat losses the most and insulation has little to no impact with that.

A full heat loss survey will tell you exactly what's happening and what should / shouldn't be done etc.

worlds goodest teecher · 08-10-2019 08:44PM

sydthebeat wrote: »

yes it would make a difference, as long as its not a brick house near the coast

Sorry to jump in on this thread but just wanted to ask why not pump cavity in houses near the coast? Does it absorb moisture?

We received our pre house purchase survey this evening from a structural engineer. The house is 20 years old and approximately 200m from the sea. He suggested that the house would benefit from installing a air to water heat pump or pumping the cavity walls. I do not think the house is air tight enough for a heat pump.

sydthebeat · 08-10-2019 08:50PM

worlds goodest teecher wrote: »

Sorry to jump in on this thread but just wanted to ask why not pump cavity in houses near the coast? Does it absorb moisture?

.

becuase the product isnt certifed for use in these areas.

for example:
http://www.ecowarm.ie/pdf/Ecobead-Cavity-Wall-IAB-Cert.pdf

3.11.2 Severe Exposure
Severe exposure to wind-driven rain applies in
districts where the driving rain index is
5m²/sec/year or more (see Figure 2). During the
pre-insulation survey of any particular building,
due regard to the exposure zones and type of
masonry construction must be assessed prior to
the commencement of the installation process.
In severe exposure areas the type of outer leaf
masonry finish where EcoBead and EcoBead
Platinum Cavity Wall Insulation System are
suitable is:
Impervious cladding and rendered walls with
a minimum cavity width of 90mm and up to
12m in height.
Unrendered brickwork is not suitable for injected
full-fill cavity wall insulation in the severe
exposure zones.

worlds goodest teecher · 08-10-2019 09:17PM

sydthebeat wrote: »

becuase the product isnt certifed for use in these areas.

for example:
http://www.ecowarm.ie/pdf/Ecobead-Cavity-Wall-IAB-Cert.pdf

This if from the engineers report:

The property is a single storey domestic house. The structure is of solid concrete block which does have a cavity, walls are rendered outside in a plaster finish and internally in a skim finish. Some of the internal walls have an insulated slab. The main building is approximately 25 years old.

The roof has had an insulation upgrade thought should be given to pumping the cavities.

sydthebeat · 08-10-2019 09:54PM

worlds goodest teecher wrote: »

This if from the engineers report:

The property is a single storey domestic house. The structure is of solid concrete block which does have a cavity, walls are rendered outside in a plaster finish and internally in a skim finish. Some of the internal walls have an insulated slab. The main building is approximately 25 years old.

The roof has had an insulation upgrade thought should be given to pumping the cavities.

I was referring to a brick house in my post

worlds goodest teecher · 08-10-2019 10:07PM

sydthebeat wrote: »

I was referring to a brick house in my post

My apologies, so the exposure level is not a factor for bead insulation with a block cavity which is rendered?

Would you have a rough idea of the price per sq meter for cavity insulation assuming there is little to none existing insulation.

sydthebeat · 08-10-2019 10:14PM

worlds goodest teecher wrote: »

My apologies, so the exposure level is not a factor for bead insulation with a block cavity which is rendered?

Would you have a rough idea of the price per sq meter for cavity insulation assuming there is little to none existing insulation.

Generally block builds are fine, once the rendering is good.

On the pricing, it's been a while since I've seen bead quotes, and it's dependent on the thickness your pumping, but I think budgeting around €10-12 per sq m of the dwelling would be about right

bunderoon · 19-02-2026 01:40PM

Resurrecting this old thread - to those who got cavity wall insulation done over the last number of years, how has it gone for ye? House stays warmer for longer?

Cavity wall pumped insulation

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