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PostPosted: Mon Sep 18, 2017 8:44 am 
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Hi All,

I am about to start removing an old single skin glass lean-to type conservatory from the back of the house. The conservatory is sat on a concrete slab, which is then tiled with floor tiles.

My plan is to use 3.5 x 1.5 inch timbers for the joists, which will be laid flat, running parallel to the house. These will be sat on plastic window packers to raise them off the tiles slightly, and secured to the concrete base through the tiles.

The deck boards will then run away from the house, with a bit of a fall to stop any standing water.

I suppose my main question is, can I fix the joists straight onto the tiles, or will I have to remove them all? And is there anything obvious that I have missed at all?

Thanks


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PostPosted: Mon Sep 18, 2017 6:39 pm 
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We'll have to assume that the tile addy was cement based rather than unibond sh1te. In which case what you propose is OK Buuuuut

Joists must be tanalised or similar for longevity; I would prefer to use cut paving slabs as supports lapped with dpm... gives a bit more clearance for any standing water.

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PostPosted: Mon Sep 18, 2017 11:08 pm 
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how will the drainage take place? your joists could be sitting an rotting in pools of water. its best to suspend decks like a suspended floor.
by the way decks are old fashioned like shag carpet an can take a few quid off a house sale


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PostPosted: Tue Sep 19, 2017 9:07 am 
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I was planning on using 5mm plastic packers to raise the joists slightly off the ground. Will that be sufficient to aid drainage and prevent the joists from rotting? My problem is that I have limited height because of the height of the patio door (about 70mm in total!)


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PostPosted: Tue Sep 19, 2017 9:57 am 
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wes56 wrote:
by the way decks are old fashioned


Good: let's hope they are swiftly followed by laminate floors and halogen down-lights. :mrgreen:

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PostPosted: Tue Sep 19, 2017 10:18 am 
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Anything wrong with keeping the tiles as your patio surface? Just suggesting it.

As to your question, if you have limited height to play with then pack it up as high as you reasonably can, the more drainage gap the better really.


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PostPosted: Tue Sep 19, 2017 1:30 pm 
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Okay I just Q? the use of joist size 3.5" laid flat ? This pic of decking I repaired shows the joist 'standing up' because hight was needed, also shows rot from bad drainage in a boxed section.
I replaced a friends decking and as he wanted a copy of the 'very' old one, with no height increase due door sill, we used 1.5" x 1.5" joists in treated wood, however the underside drainage was good such that the original joists were still sound, only the planking rotted due lack of treatment. You presumably have a level base and so 5mm is going to be minimal for sitting water


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