Laying paving stones on asphalt - - is this possible?

[wondergirl29]

I have a large outside terrace which forms the roof of the flat below.
Therefore, the terrace is formed of a concrete base with a layer of hi-density foam and then asphalt on top.

There is currently decking over the asphalt and I would like to replace it with paving stones.

- Is this possible, can you lay paving stones on the asphalt and if so how would you bed them in?
Would you use a concrete morter mix?

I'm sure it must be possible somehow as many terrace apartment blocks have paving stones laid on the terrace ....but perhaps they start with a different base?

Any advice, suggestions would be welcome.
Thanks!

[r896neo]

Purpose made promenade tiles are more often used in this scenario and are usually laid on bitumen or on little spacers which keep them off the roof deck.

It largely has to do with the current roof make up but there are others on here who can give definitive advice.

Obviously suitability of the roof for loading is key and may influence the method

[ringi]

Patio Deck from Bradstone may be what you need.

[PavingSuperstore]

Pavepads are usually used for roof terraces and balconies. These enable the paving slabs to be raised off the ground slightly and they are supported on each of the corners with the pads. They are circular in shape with a quadrant imprint for setting the paving into. Shims are used to level the paving out. The main thing to note is that the paving needs to be of a certain thickness to be safe in this setting - as a guide, this is 50mm for concrete paving and at least 30mm for say granite for example. Also, don't go for exceptionally large slabs as these are difficult to support this way - I would suggest maybe a 400x400 would be about right. You can sometimes use larger slabs, but think about having extra support in the middle. Generally speaking, it's always a sawn or flat finish used with Pavepads - I cannot it image it would look right any other way.

[GB_Groundworks]

but you cant use them on an asphalt roof as the feet will puncture the asphalt

weve used promenade tiles from castle composites on exactly same situation. there are some photos on here in the recent work thread from last year

[PavingSuperstore]

The manufacturers information says they can be used on Asphalt, Bituminous Felt, Pvc Single Ply Membrane and Liquid Coating Roofing Systems.
Worth checking to be certain, but as far as I'm aware they are OK in this setting. From recollection last time we used them they don't have any feet so wouldn't dig into the asphalt.

[Tony McC]

Over asphalt or bitumen roofs, the usual spec is a load-spreading weatherproof decking sheet with the paving set onto the *Pedestals" (correct term).

There needs to be effective drainage and the type/size of pedestal can be determined by working out rook load-bearing potential and weight of paving. There are specialist suppliers and supplier-installers who are best used for these types of projects.