Posted: Fri Jun 28, 2013 7:44 pm
Hi Everybody!
We are in the process of tendering for a project where we have to lay 100 x 100 x 50mm granite setts on a rooftop garden.
The maximum build-up we can achieve is 60mm (leaving only 10mm for a bed). Since the paving is on a flat roof, there will be a certain amount of flexibility required (although from our site visit, the deflection on the roof structure is undetectable). Nevertheless, there will be a certain level of deflection and so we will have to install the granite setts on a flexible compound.
We have wondered if using a lime mortar mix would be sufficient for the bed because of its flexible / forgiving properties. However, we are just concerned that the setts may start to delaminate from the mortar bed.
We are also considering using a good quality external grade / flexible tile adhesive and perhaps use a jointing compound for the pointing such as Everbuild's Geo-Fix Paving Jointing Compound because of it's flexible properties.
As I mentioned earlier, there is no detectable deflection in the roof structure, but there is bound to be some level of movement. The roof structure consists of heavy section steel universal beams, with a 38mm HDX P5 moisture resistant tongue and groove board and a fibreglass finish.
We were just wondering if anybody had experience of working with such restrictions and could offer any advise on a method / specification for a flexible 10mm bed and joints.
Many Thanks
We are in the process of tendering for a project where we have to lay 100 x 100 x 50mm granite setts on a rooftop garden.
The maximum build-up we can achieve is 60mm (leaving only 10mm for a bed). Since the paving is on a flat roof, there will be a certain amount of flexibility required (although from our site visit, the deflection on the roof structure is undetectable). Nevertheless, there will be a certain level of deflection and so we will have to install the granite setts on a flexible compound.
We have wondered if using a lime mortar mix would be sufficient for the bed because of its flexible / forgiving properties. However, we are just concerned that the setts may start to delaminate from the mortar bed.
We are also considering using a good quality external grade / flexible tile adhesive and perhaps use a jointing compound for the pointing such as Everbuild's Geo-Fix Paving Jointing Compound because of it's flexible properties.
As I mentioned earlier, there is no detectable deflection in the roof structure, but there is bound to be some level of movement. The roof structure consists of heavy section steel universal beams, with a 38mm HDX P5 moisture resistant tongue and groove board and a fibreglass finish.
We were just wondering if anybody had experience of working with such restrictions and could offer any advise on a method / specification for a flexible 10mm bed and joints.
Many Thanks
