Pocster Posted October 23, 2018 Author Posted October 23, 2018 (edited) 2 minutes ago, JSHarris said: I thought the EPDM was over cement board and then the concrete was over the top of that? Anyway, GRP can be laid over concrete, just needs the concrete to be primed with G4 first. Yes ; layers are correct So I’m stripping this back to the 30mm concrete ( defective EPDM is below that ) Why oh why did he ignore grp so dismissively..... Edited October 23, 2018 by pocster
Pocster Posted October 23, 2018 Author Posted October 23, 2018 Went back to this thread Sigh!; still none the wiser. The guy that visited said he had no real idea how to 'finish' the edpm at the edges - but with grp it could be done. ( once he recovered from his obvious shock) If I'm 'floating' the tiles on pedestals ; why can't I float the parking area also?? on a special purpose construction??? This then solves the issue of car/concrete on grp (or edpm) Ignoring 'depth' issues - what would theoretically be wrong with say a steel structure to support the driveway?
Jeremy Harris Posted October 23, 2018 Posted October 23, 2018 24 minutes ago, pocster said: Went back to this thread Sigh!; still none the wiser. The guy that visited said he had no real idea how to 'finish' the edpm at the edges - but with grp it could be done. ( once he recovered from his obvious shock) If I'm 'floating' the tiles on pedestals ; why can't I float the parking area also?? on a special purpose construction??? This then solves the issue of car/concrete on grp (or edpm) Ignoring 'depth' issues - what would theoretically be wrong with say a steel structure to support the driveway? I agree with him, GRP would make the detailing around the awkward areas at the edges and upstands a lot simpler to implement, and likely be significantly more reliable in the long term. I also think that the idea of a galvanised steel subframe, that's free draining and which supports the pavers is a good one. You can then just ensure that the GRP "bathtub" underneath is properly drained, so water runs off easily, so reducing the risk of any water getting close to the junction of the roof lights and the top of their upstands. At a guess, standard walk way galvanised grating, like this, may well do the job, fitted to stand off legs with load spreading plates underneath them: https://www.themetalstore.co.uk/products/galvanised-steel-walkway You could opt to just leave the grating exposed, even, or go for a GRP grating like this stuff: http://www.duracomposites.com/industrial/fibreglass-grp-grating/ 1
Pocster Posted October 23, 2018 Author Posted October 23, 2018 8 minutes ago, JSHarris said: I agree with him, GRP would make the detailing around the awkward areas at the edges and upstands a lot simpler to implement, and likely be significantly more reliable in the long term. I also think that the idea of a galvanised steel subframe, that's free draining and which supports the pavers is a good one. You can then just ensure that the GRP "bathtub" underneath is properly drained, so water runs off easily, so reducing the risk of any water getting close to the junction of the roof lights and the top of their upstands. At a guess, standard walk way galvanised grating, like this, may well do the job, fitted to stand off legs with load spreading plates underneath them: https://www.themetalstore.co.uk/products/galvanised-steel-walkway You could opt to just leave the grating exposed, even, or go for a GRP grating like this stuff: http://www.duracomposites.com/industrial/fibreglass-grp-grating/ Wish you were my architect @JSHarris
Onoff Posted October 23, 2018 Posted October 23, 2018 Galvanised steel sitting in damp will rust like f*** and surprisingly quickly too.
Jeremy Harris Posted October 23, 2018 Posted October 23, 2018 2 minutes ago, Onoff said: Galvanised steel sitting in damp will rust like f*** and surprisingly quickly too. I've got a 30+ year old galvanised anchor that suggests otherwise! Even my old galvanised mooring chains, would wear before they corroded out. I think there is a problem with a lot of supposedly galvanised steel not being proper hot dip galvanised, which may well be a part of the problem, but we had galvanised grating walkways running over concrete ducts at work that had been there thirty years or more and still looked OK. Failing that, the Duracomposites stuff I linked to would probably last forever. IIRC, it's very similar to the stuff used on oil rigs.
Pocster Posted October 23, 2018 Author Posted October 23, 2018 6 minutes ago, Onoff said: Galvanised steel sitting in damp will rust like f*** and surprisingly quickly too. The galvanised steel ‘mesh’ would be on stilts I.e raised away from the water
Jeremy Harris Posted October 23, 2018 Posted October 23, 2018 Just now, pocster said: The galvanised steel ‘mesh’ would be on stilts I.e raised away from the water You could probably raise it up on high density concrete blocks, or brick piers, if the thicknesses work out.
Pocster Posted October 23, 2018 Author Posted October 23, 2018 2 minutes ago, JSHarris said: You could probably raise it up on high density concrete blocks, or brick piers, if the thicknesses work out. This is what I thought . All depends on steel thickness required .....
Jeremy Harris Posted October 23, 2018 Posted October 23, 2018 On 23/10/2018 at 18:56, pocster said: This is what I thought . All depends on steel thickness required ..... You could have a look at using the steel grating in place of the pavers. Some of them look pretty good, and it would be one less expense. There are systems made that have only narrow slots, that can even be walked on in stilettos, should you be minded to... 1
Pocster Posted October 23, 2018 Author Posted October 23, 2018 1 minute ago, JSHarris said: You could have a look at using the steel grating in place of the pavers. Some of them look pretty good, and it would be one less expense. There are systems made that have only narrow slots, that can even be walked on in stiletto, should you be minded to... Might come to that just to save on height
Jeremy Harris Posted October 23, 2018 Posted October 23, 2018 11 minutes ago, Onoff said: No composite grating that woukd fit the bill? Yes, in the link I gave earlier there's even one that will take gravel on top, from the look of it: http://www.duracomposites.com/industrial/fibreglass-grp-grating/micro-mesh-grating-drainage-grating-walkways-grating-catwalk-grating/ Mounts on pillars, too: 1
Pocster Posted October 23, 2018 Author Posted October 23, 2018 (edited) Hang on ! Am I being thick !! What’s wrong with making a concrete parking slab and then simply grp up the sides of that direct to the floor . No need to grp under it ! Though grp would go over the parking area - that might be an issue ... ?!?!? ? Edited October 23, 2018 by pocster
Pocster Posted October 23, 2018 Author Posted October 23, 2018 Or perhaps just EPDM over the parking slab ( to keep architect happy ) . So EPDM overlaps grp on sides of parking slab . Sensible ? ??
Jeremy Harris Posted October 23, 2018 Posted October 23, 2018 You can't mix solutions, as that's a recipe for failure. If going for GRP, then create a single, integral, GRP "tub" over the entire roof area, including the edges and upstands, with no breaks or joins.
Pocster Posted October 23, 2018 Author Posted October 23, 2018 (edited) 4 minutes ago, JSHarris said: You can't mix solutions, as that's a recipe for failure. If going for GRP, then create a single, integral, GRP "tub" over the entire roof area, including the edges and upstands, with no breaks or joins. Exactly ! . But if *just* the top of the parking slab was EPDM it could overlap the grp . EPDM just to keep Architect happy - then driveway pavers ontop this so ‘tub’ ; sides ; upstands ; side of parking slab all grp - continuous . Edited October 23, 2018 by pocster
Pocster Posted October 23, 2018 Author Posted October 23, 2018 Car parking area is essentially a giant upstand - but with edpm just on top ....
Onoff Posted October 23, 2018 Posted October 23, 2018 (edited) As we're "thinking out loud"... How about...EPDM then rubber mat: https://www.matsgrids.co.uk/rubber-grass-mats/65-16mm-rubber-grass-mats-150x100-5060423910770.html? Then blocks laid on sand / cement mix. I should point out I've just necked a large Cobra... Edited October 23, 2018 by Onoff 1 1
Pocster Posted October 23, 2018 Author Posted October 23, 2018 1 minute ago, Onoff said: As we're "thinking out loud"... How about...EPDM then rubber mat: https://www.matsgrids.co.uk/rubber-grass-mats/65-16mm-rubber-grass-mats-150x100-5060423910770.html? Then blocks laid on sand / cement mix. I should point out I've just necked a large Cobra... All suggestions welcome ! Non standard build requires non standard solution!
Jeremy Harris Posted October 23, 2018 Posted October 23, 2018 3 minutes ago, pocster said: Car parking area is essentially a giant upstand - but with edpm just on top .... I doubt you'd get a reliable joint, so would suggest you just GRP the whole area, to make one integral, watertight, composite roof with no joints. Joints are always going to be the Achilles heel of any waterproofing system, and the really big advantage of GRP is that there are no joints.
Onoff Posted October 23, 2018 Posted October 23, 2018 Just now, JSHarris said: I doubt you'd get a reliable joint, so would suggest you just GRP the whole area, to make one integral, watertight, composite roof with no joints. Joints are always going to be the Achilles heel of any waterproofing system, and the really big advantage of GRP is that there are no joints. I like the idea of grp. Easy to repair too! Maybe with something with "give" on top before the paving. See @Barney12's roof with integral, hidden gutter to see just how good it can look.
Pocster Posted October 23, 2018 Author Posted October 23, 2018 (edited) 7 minutes ago, JSHarris said: I doubt you'd get a reliable joint, so would suggest you just GRP the whole area, to make one integral, watertight, composite roof with no joints. Joints are always going to be the Achilles heel of any waterproofing system, and the really big advantage of GRP is that there are no joints. But that means driving over grp - my architect ‘s nightmare . Might be more acceptable because it’s not at floor level .... Could even grp over the slab and EPDM - everyone’s happy then !! Edited October 23, 2018 by pocster
Onoff Posted October 23, 2018 Posted October 23, 2018 Perforated rubber sheet! Might even be enough left to run yourself up an evening number... Says can be used as a drainage mat. https://www.silex.co.uk/products/perforated-silicone-sheet/
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