Hi
laid two patios with riven Indian sandstone flags. Laid on 5to1 sharp sand and cement with plasticiser.
wettish mix slightly stiffer than a wet bricklaying mix. Continuous Solid bed and pointed next day with 3to1 mortar mix.
Looks great initially but it's not bonded to the back of the Slabs in that you get a hollow sound when you knock them and getting hairline cracks on the pointing.
After the first time I thought my issue was too dry mix but second time was wet and still got the problem but not as bad.
Any idea what I'm missing as otherwise the job looks good. Should i Sbr back of each slab as I go?
Cheers for any tips
laid two patios with riven Indian sandstone flags. Laid on 5to1 sharp sand and cement with plasticiser.
wettish mix slightly stiffer than a wet bricklaying mix. Continuous Solid bed and pointed next day with 3to1 mortar mix.
Looks great initially but it's not bonded to the back of the Slabs in that you get a hollow sound when you knock them and getting hairline cracks on the pointing.
After the first time I thought my issue was too dry mix but second time was wet and still got the problem but not as bad.
Any idea what I'm missing as otherwise the job looks good. Should i Sbr back of each slab as I go?
Cheers for any tips