Bedding pavers onto bifold cill

[paro]

Hi All - I need to tackle the patio behind the extension in the next few weeks and am looking for some advice on how something is usually done. The origin site shows you just laying a paver directly onto the cill which I cannot believe it an okay way to do this.   There is supposed to be a weathered threshold between the internal and external floor with about 10mm difference. I am going to come down a bit more than that, say, 15mm to make sure the riddculously oversized doors don't have any clearance issues. What is the right method to bring the slabs right up to the door frame over the cill here please?  Not sure if heat related expansion and contraction needs to be considered for the aluminum cill as well.

 

Planning to use large format porcelain pavers.

 

Any advice welcome. 

 

Thanks, Paul

 

 

 

[Nickfromwales]

You can’t bring them to the frame. You’d normally put a slot ACO drain in and then lay up to that, so a linear slot drain deals with rainwater runoff from the doors.

 

You’d need to add an ACO (if you aren't on very permeable ground) and that sits at the end of the sill. Then pavers get laid to that. 

[paro]

That makes a lot more sense, thanks.  This is screenshot from the origin windows video that I watched originally. It always seemed a bit suff to just lay onto the cill. Now need to find a cill that fits.

 

 

Origin vid

 

 

[paro]

If anyone knows of a channel drain that can fit into a 47mm gap under the door I'm all ears. The only thing I can find is somehting that's £210 p/m plus crazy corner prices

 

https://www.aquabocci.co.uk/products/a30-low-profile-drain-120mm-wide-x-35mm-deep

 

Another reason to add to the long list of why I regret buying these overpriced hunks of aluminum.

 

 

[Russdl]

@paro Have you considered a pedestal system for your large format tiles?
 

You could put a French drain under the doors. I reckon that would solve all your issues. 
 

 

 

 

[Mr Punter]

39 minutes ago, Russdl said:

Have you considered a pedestal system for your large format tiles?

 

+1 I have used these and they work well.  You do need a perimeter edge to retain the paving but that is the case whatever you do.

[paro]

I really like the look of that as it's something I could actually do. (I'm for any job that doesn't have a clock on it for materials drying). The only issue I see with that other than maybe height of the floor is that I have a manhole in the middle of the space. I need to think about how I fix something down on the cill at the right height to provide that edge support. 

 

Thanks.

 

[Russdl]

It’s very DIY’able

 

Height of what floor? Internal floor? You can adjust the height of the pedestals from ‘not many mm’ to ‘quite a lot of mm’. 
 

You could probably cover the manhole with the tiles, hiding it completely, and lift the tiles when access is required. It takes seconds to lift and replace the tiles. 
 

For the cill you could make little mini slabs, the size of the pedestal foot, that sit on the cill and hold the front of the tile.  
 

Added bonus’s:

 

Free draining round the perimeter of every tile. 

No grout to fail. 

 

No place for weeds to grow

 

If you change your mind re shape/layout it’s very easy to rearrange. 

[Russdl]

 

[paro]

Thanks for this. Had a good look over the last few days. The only issue I think there could be is the cantilever overhang for the cill of the bifold. Unless I can sit the slab on a batten or something I don't think there is a bracket available to accomdate the extra 100mm overhang. 

 

Found a Robin Clevett video on YT the the other day doing exactly what I need with decking. I'm not that keen on decking but at least this would be a method I can be sure will work.

[torre]

Something like this would be shallow enough and affordable, can't vouch for the quality though.

https://vodaland.co.uk/products/easy-low-plastic-channel-drain-with-plastic-grate

You do get clips to retain the edge of tiles on pedestals but they won't give much additional support to the overhang. 

[Russdl]

1 hour ago, paro said:

The only issue I think there could be is the cantilever overhang for the cill of the bifold.

The still image from the video you posted above shows a mini concrete slab over the cill. You could do that and have the tiles resting on the concrete and then supported by pedestals as you move away from the cill. 

[Mr Punter]

19 minutes ago, Russdl said:

The still image from the video you posted above shows a mini concrete slab over the cill. You could do that and have the tiles resting on the concrete and then supported by pedestals as you move away from the cill. 

 

Yes I would fix a temporary timber to the face of the brickwork and cast a sand cement infill on top of the ali cill for the back of the first paver to rest on.