My hidden gutter + warm roof + can we simplify...

[BartW]

Hi,

Many weeks and months later, I have now come up with my iteration of hidden gutter.

 

Drawing simplified for the purpose of modelling below, BUT can I:

 

- get rid of stop battens knowing I will be using helical fixings?

- if needed with stop batten, can I have just one? 

- as the above, do they need to be laid flat?

- any other hints?

 

 

Thanks 

Bart

 

 

 

 

[JohnMo]

Have you got a huge gap in your insulation between roof and wall?

[Mr Punter]

I think these can be a world of pain.

 

I would rather have the insulation right down to the box gutter.  Fill under the ply box with compressible insulation.  Cut a strip of rigid 150mm insulation maybe 400mm wide at exactly the correct angle to slide snugly up to the ply, then use this strip to start laying the remaining insulation.  Don't bother with the stop battens.

 

Where does water discharge?

 

Have you accounted for overflow?

[Temp]

3 hours ago, Mr Punter said:

Have you accounted for overflow?

 

+1

 

Imagine a down pipe has blocked and water levels in the gutter rise until overflowing. Can it get into the structure? 

[BartW]

4 hours ago, JohnMo said:

Have you got a huge gap in your insulation between roof and wall?

As per the first post, simplified for the purpose of this.

 

The insulation would extend as far down as practical, and there would also be a layer of insulation between the rafters in the cold bridge (non insulated to the top) area.

[BartW]

3 hours ago, Mr Punter said:

I think these can be a world of pain.

 

I would rather have the insulation right down to the box gutter.  Fill under the ply box with compressible insulation.  Cut a strip of rigid 150mm insulation maybe 400mm wide at exactly the correct angle to slide snugly up to the ply, then use this strip to start laying the remaining insulation.  Don't bother with the stop battens.

 

Where does water discharge?

 

Have you accounted for overflow?

 

Yes, the plan is to insulate all around the box. 

 

Water discharge will be through a set of downpipes either end of the building. Sadly into the warm loft area and out again just outside in the battened void area behind slates.

 

No overflow, but the front of the box would be lower than the back, so in theory it should spill through the outside. Was also thinking there could be a tray made out of EDPM that would tank the underside of the gutter.

 

Still not convinced, as there is so little space.

 

 

I am basically trying to replicate the Krop gutter system, but compacted, as theirs is 200mm wide...

 

 

[BartW]

24 minutes ago, Temp said:

 

+1

 

Imagine a down pipe has blocked and water levels in the gutter rise until overflowing. Can it get into the structure? 

 

In theory it shouldn't but that's theory.