Couple of options - thoughts welcomed

[mjc55]

Just in planning but am thinking of construction details.

 

We are planning to use Ecobrix to construct the house and I have been thinking through the options.  I haven't worked out u-values yet but will do that.

 

I have attached a drawing of the two options, one using the 365mm width blocks, one the 300mm.

 

The narrower has two advantages in that

 

a) lighter, so easier to handle

b) thicker contiguous insulation to outside

 

Externally we will be going for timber clad on 3 sides, render on the other.

 

I haven't worked out cost differences so that might have an impact but in the meantime would welcome thoughts.

 

Please don't use this thread to discuss the merits or otherwise of Ecobrix, I know there are varying opinions, this isn't the place for that.

 

 

 

 

[JohnMo]

Assume Ecobrix is the new name for Durisol?  We used 365mm with a 50mm service void inside and that will give a U value of 0.14 without anything else.

 

Not sure I would bother (I didn't) with the 300mm nor the additional external insulation on either. Your into the territory of diminished returns.

 

Biggest issue with both blocks is design of your air tightness layer. Do you have thoughts?

[mjc55]

23 minutes ago, JohnMo said:

Assume Ecobrix is the new name for Durisol?  We used 365mm with a 50mm service void inside and that will give a U value of 0.14 without anything else.

 

Not sure I would bother (I didn't) with the 300mm nor the additional external insulation on either. Your into the territory of diminished returns.

 

Biggest issue with both blocks is design of your air tightness layer. Do you have thoughts?

 

Thanks for that, I will probably work the numbers out anyway, I enjoy that sort of thing (I know!)

 

There is the weight issue to consider, my oily rag wife wants to help as much as possible and lighter blocks to move around might be a consideration.

 

As regards air-tightness, I haven't really thought much about that yet, I had very briefly considered external to the block (or insulation if I went that way) but as we are going with cladding puncturing that layer with fixings could be an issue!  I will be looking at this in more detail soon.

[JohnMo]

Starter fir your calcs on U value calcs for 300 and 365mm blocks

 

 

[JohnMo]

You can download all sorts here, including the build manual, which is where the calcs came from. It also has all the thermal thermal bridging calculation for all standard details with are all SAP EPC approved.

 

https://durisol.uk/technical-resources/

Edited September 4 by JohnMo

[mjc55]

43 minutes ago, JohnMo said:

You can download all sorts here, including the build manual, which is where the calcs came from. It also has all the thermal thermal bridging calculation for all standard details with are all SAP EPC approved.

 

https://durisol.uk/technical-resources/

Yes, got those 👍