Lime mortar thickness under limestone paving slabs

[eros_poli]

Hi, 

 

Struggling to find any sage advice out there on the thickness of the mortar bed to use when laying limestone slabs. 

 

This is internal, and we're thinking of using 15mm Travertine slabs. 

 

These will be laid on a Mike Wye-supplied Geocell/Limecrete floor, which will be finished with nhl5 lime slab. 

 

I assume it would be best to also use NHL5 as the bed for the slabs, and am guesstimating that 20mm would be a good thickness to aim for.

 

Should it be thinner...? Need to know for the excavations working backwards from finished floor level. 

 

Cheers!

 

Joe

[nod]

 The same thickness as what your laying 15 mil

[nod]

54 minutes ago, nod said:

 The same thickness as what your laying 15 mil

Don’t forget to seal them 

[SteamyTea]

24 minutes ago, nod said:

Don’t forget to seal them 

Will that not defeat the reasons for using lime?

[nod]

19 minutes ago, SteamyTea said:

Will that not defeat the reasons for using lime?

I definitely wouldn’t use lime 

[SteamyTea]

3 minutes ago, nod said:

I definitely wouldn’t use lime 

Nor me, but no matter how you show that cement/concrete mixes can have the same properties, there is no changing peoples minds, they are still stuck in Roman times.

This is a bit different as the floor is already there, so too late for education.

 

(sorry to be blunt, but this fixation with an inferior product must stop)

[jayc89]

Assuming your limecrete floor is NHL5, you've lost (pretty much) all breathability already, so whatever you use as your adhesive won't really matter. 

[Roger440]

45 minutes ago, jayc89 said:

Assuming your limecrete floor is NHL5, you've lost (pretty much) all breathability already, so whatever you use as your adhesive won't really matter. 

 

This ^^^^^

 

The important part of your build up, assuming its a a suitably old house is the geocell layer.

Edited August 19, 2024 by Roger440

[eros_poli]

13 hours ago, nod said:

 The same thickness as what your laying 15 mil

Thanks for the only reply that's actually answered the question!

[nod]

40 minutes ago, eros_poli said:

Thanks for the only reply that's actually answered the question!

Your welcome