Ducting Through Slab & Fire Stopping

[Stratman]

Hi All and Happy New Year!

 

I've been going through Building Control queries to my recent application and came across fire separation between the house and adjoining garage. There will be a connectiond door: FD30 with self closer, that's all fine.

 

It's an MBC timber frame and insulated raft foundation - MBC will install waste pop ups and services ducts through the slab.  I would like bring the electrical cable from an outside wall meter cupboard into a consumer unit in the utility.  And also run pipes from an ASHP outside via the garage, into the house and to a utility space.  I'm proposing this detail below, but would appreciate some feedback on the duct (depth and radius suitability for pipework and cables) and suggestions on how to maintain 30 minute fire separation between the house and garage.

 

 

Any thoughts?

[JohnMo]

Think the bend radius for getting pipes through is way to small, firstly.

 

Why run pipes through floor at all. Take them from outside direct in to house.

[saveasteading]

17 minutes ago, JohnMo said:

direct in to house.

Exactly so. The fire stopping is easy so we can look at that when you have decided on a simple route and the pipe and cable and  insulation sizes.

 

There seems to be eps exposed in the garage. Does that get protected?

 

[Stratman]

4 hours ago, JohnMo said:

Why run pipes through floor at all

I've seen several posts on here recommending ducting services through slab. I assumed it was for better insulation and airtightness. Maybe I've got the wrong end of the stick. 

[Stratman]

3 hours ago, saveasteading said:

There seems to be eps exposed in the garage

Yes, I would cover it with a skirting for protection.

[JohnMo]

4 minutes ago, Stratman said:

I've seen several posts on here recommending ducting services through slab. I assumed it was for better insulation and airtightness. Maybe I've got the wrong end of the stick. 

People generally do it to get to a plant room in the middle of the house.

 

I would just run pipe along wall and cover in 25mm external insulation.

 

4 minutes ago, Stratman said:

Yes, I would cover it with a skirting for protection.

Does that give any fire protection?

[saveasteading]

18 minutes ago, Stratman said:

I would cover it with a skirting for protection.

Cement board will be stronger and provide fire protection.

[Nickfromwales]

Add some counter battens and take the FR plasterboard down to 10mm shy of the slab, then fill the void with intumescent mastic. Then put a skirting on top for mechanical protection.  

[Nickfromwales]

6 hours ago, Stratman said:

Hi All and Happy New Year!

 

I've been going through Building Control queries to my recent application and came across fire separation between the house and adjoining garage. There will be a connectiond door: FD30 with self closer, that's all fine.

 

It's an MBC timber frame and insulated raft foundation - MBC will install waste pop ups and services ducts through the slab.  I would like bring the electrical cable from an outside wall meter cupboard into a consumer unit in the utility.  And also run pipes from an ASHP outside via the garage, into the house and to a utility space.  I'm proposing this detail below, but would appreciate some feedback on the duct (depth and radius suitability for pipework and cables) and suggestions on how to maintain 30 minute fire separation between the house and garage.

 

 

Any thoughts?

KISS. Stuff a load of A1 rated loose rockwool down the garage side of the ducting, and leave it 20mm below the slab. Then pour some SLC in as a cap. Will stop rodents too. 

[Stratman]

Thanks guys. I feel daft for having considered this route, but at least now I have seen the light! Learning is what it's all about on here, right?

[Nickfromwales]

26 minutes ago, Stratman said:

Thanks guys. I feel daft for having considered this route, but at least now I have seen the light! Learning is what it's all about on here, right?

Every days is a school day, for all of us mate