1st Time Self Builder

crosstreesjb

Hi all,

I am a first time self builder and have decided to go down the timberframe route with the aquapanel outdoor cement board render system.
The house is a 300m2 two storey house and I would be very grateful for feedback on peoples experiences of using these systems.
I am going for a U-Value of 0.15 W/m2k and targeting as good an airtightness as I can achieve. Target being 3ach. I am using both solar and MVHR systems with underfloor heating on the ground floor.
I am trying to assess the need for radiators in the upstairs area and again would be very interested on peoples experiences.

Thanks,

CJB

homewardbound11

crosstreesjb wrote: »

Hi all,

I am a first time self builder and have decided to go down the timberframe route with the aquapanel outdoor cement board render system.
The house is a 300m2 two storey house and I would be very grateful for feedback on peoples experiences of using these systems.
I am going for a U-Value of 0.15 W/m2k and targeting as good an airtightness as I can achieve. Target being 3ach. I am using both solar and MVHR systems with underfloor heating on the ground floor.
I am trying to assess the need for radiators in the upstairs area and again would be very interested on peoples experiences.

Thanks,

CJB

Interesting. The exact same as my buiild. idnt use aquapanel due to cost and home insurance prices.block is their preference. I used råds upstairs and the are rarely if ever used but it is nice to heat when needed. I'd not use 3 at q50 airtest. I would be aiming ay 1/2 that to be honest. You would probably be ok with just electricL storage heaters if ever u needed them.

What is your stud thickness and insulation. Have u chosen cellulose. I found that the house is marginally colder in year 2 to 3 and this could be possibly settlement of the cellulose. If I were possible to see this but I can't so I am only assuming this.

crosstreesjb

Thanks for the feedback. Will aim for the level of airtightness you said and have a call in for my insurance broker re the cost of home insurance using external render and not brickwork.
Stud thickness is 89mm with fibreglass as the insulation. I'll prob go with rads upstairs for the same reason as it's what we are used to.

homewardbound11

crosstreesjb wrote: »

Thanks for the feedback. Will aim for the level of airtightness you said and have a call in for my insurance broker re the cost of home insurance using external render and not brickwork.
Stud thickness is 89mm with fibreglass as the insulation. I'll prob go with rads upstairs for the same reason as it's what we are used to.

Have you gone with the timberframe order. 89mm stud doesn't offer much in terms of insulation. I would get more advice on this if you can possibly increase this. 90mm external stud would have been standard 15 years ago. I would have thought 140 would be the minimum. Just check that your walls are meeting building regs standard at least. Your engineer architect or ber consultant will help you, no point having a house that can heat up quickly and only to cool down as quick.
We went with and at the time was a bit over kill was a 235 stud plus a 50mm insulated cavity. This helped the house to hold heat as a store.
That was 3years ago now.

crosstreesjb

sorry think I was confused. I gave the internal stud dimensions. The external stud is 240mm with rigid insulation. I am getting a preliminary BER done to see what rating I can get using 0.7 W/m2k windows and a low airtightness result as mentioned earlier.