Is there any reason NOT to have cavity wall insulation via government grant?

Chickereeeee

I was thinking of getting my house's cavity walls walls insulated with EPS beads, and got a couple of quotes. I find I can get a government grant to fund this, and it would be done by a company call Evolve (www.evolvehes.co.uk). (House is 1920s build, 50mm cavity).

Is there any reason NOT to have it done via the grant, using LAs selected company? 

I worry about rushed work, warranty complexity etc,  but would not mind saving £2k!

FFHillbilly

yes there are a few of reasons not to, porous bricks and likelihood of wind driven rain. I was working in a 1970's brick build house whilst the builders were knocking through for an extension on a wet day, they removed all the inside block wall and exposed the back of the outer brick skin which was absolutely soaking wet, water dripping down the inside. was surprising really as from the outside all the pointing looked to be good, but what I didn't realise at the time was that most bricks are very porous and once they are wet, water soaks through.

Chickereeeee

FFHillbilly said:

yes there are a few of reasons not to, porous bricks and likelihood of wind driven rain. I was working in a 1970's brick build house whilst the builders were knocking through for an extension on a wet day, they removed all the inside block wall and exposed the back of the outer brick skin which was absolutely soaking wet, water dripping down the inside. was surprising really as from the outside all the pointing looked to be good, but what I didn't realise at the time was that most bricks are very porous and once they are wet, water soaks through.

Thanks, but I am not asking if it should be done, just the route to getting it done.

Silvertabby

Why?  Because it's something for free, regardless of the consequences?

We were already doubtful when a company offered this on our estate.  Then the  (chartered surveyor) son of a neighbour told his mum not to touch it with a bargepole, as the beads could bridge water from the outer to inner bricks.  

subjecttocontract

I've had cavity wall insulation on 4 properties over the past 40 years and never had a problem. 
1. Had foam pumped into the cavity and got an installation certificate.
2. Had cavity wall insulation bats or panels installed as the brickwork went up.
3 & 4 Already had it fitted so don't know what it was.
No damp, no problems, no cause for concern.

Simonon77

My house has the bead insulation, was put in before I bought it so don't know how long ago. I have been here 16 years though and never had any damp problems. I think a wall would have to be very wet for moisture to soak all the way through the bricks then bridge to the inner walls

stuart45

Occasionally CWI can cause damp problems. It's normally on walls that get a lot of wind driven rain, have walls in need of a repoint, or cavities with mortar on wall ties etc. A decent firm should check the suitability of the walls for CWI before starting work.