Bifold/sliding door opening

[Nathan110]

Hi all,

Brickie doing the opening of the extension this week with a 4 opening.

Planning to order some bifolds/sliding doors from a company with spec speficifying 4m brick work opening as the frame is 3990. Brickie says he wants to leave more of an opening by 7mm either side to the 4m so it's fits in properly and so the seal can go all the way in. Would you do this too?

 

[Swwils]

Do it to the bifold specialist specification.

 

[^woody^]

I'd get a different brickie.

 

[Nathan110]

Do it to the bifold specialist specification.

This would make sense to me and brickie is happy to do that but personally advises me to leave a larger tolerance than the 5mm on each side recommended as the seal around wont be as great as 10mm on each side. Can understand his argument about the seal being able to go through more of the depth. Should I make sure he doesn't do this then?

 

[Swwils]

The gap is dicticated by the manufacturer and the construction of the door, normally to BS8213-4.

Aluminium frame on a 3.5-4m opening usually reccomended 7.5mm per side. I assume your frame will be a lighter colour and not subject to much thermal movement, otherwise the manufacturer may reccomend more.

Any gap over 5mm should have a backer rod placed and a joint depth of at least 5mm.

 

[^woody^]

I would suspect that door manufacturers know more about their specific products than a bricklayer.

Generally in building you want no, or as smaller gaps as possible, not larger gaps.

 

[Nathan110]

Thanks Woody

 

[Nathan110]

OK need your thoughts on this please

Not sure what to do from the sliding opening to the garden. There is an approx 1.3m drop. Initially planned for steps but would like a 3m long towards the end of the garden patio to be flush one eng brick under the air vents. Would you construct this from block and beam to have some storage under? See picView attachment 246290

 

[freddiemercurystwin]

Do you have planning permission for a 3m wide patio?

 

[Nathan110]

Does constructing a patio need permission too?

 

[Nathan110]

went down prior approval, and the height for the extension was measured as the highest natural ground adjacent. As there is an approx 1m drop at the lawn would rather have a patio at the rear, rather than stairs. PP is a must? Thanks woody, fmt, tony etc in advance for your wisdom

 

[freddiemercurystwin]

Without planning permission, any patio or raised deck height is limited to 300mm above the highest natural ground level beneath it.

 

[^woody^]

natural ground level beneath it

It's just "ground level" nowadays.

And it's "adjacent" to it, not under it. So that would mean the ground by the building if that's higher.

 

[Nathan110]

We calculated the PD height of 3. based on the immediate ground adjacent. The red arrow is 0.3m lower than the front of house and The blue arrow is 1m lower. It will mean the end of the extension is 4m heigh. Also we have taken away a lot of the land from the slope as a large garage was previously sitting on it.

 

[Nathan110]

Woody does the above make sense and would you see that as acceptable given the end of the extension being 4m. The PD under prior approval says max height is 3m but the definition of height says any land adjacent so I'm hoping this is OK.