Posted: Fri Sep 25, 2015 6:52 pm
Hello
I laid an Indian sandstone patio a 2 months ago. It was my first ever effort at laying a patio and I was really happy with the results. Until now! Algae has started to build up in the joints. It was pointed using a fairly dry sand and cement mix 4-1. When I say fairly dry, it would hold its shape when compressed but no water seeped out. The bit I did first was a little wetter but it took me ages to do so that's why I started using a dryer mix. The part done with the wetter mix is aslightly different colour but it's not too noticeable as it's near the back of my garage. This first section doesn't seem to be affected by the algae yet! Is the algae growth due to the dryer mix being slightly more porous than the wetter mix? And is there anything I can do to stop it?
Cheers
I laid an Indian sandstone patio a 2 months ago. It was my first ever effort at laying a patio and I was really happy with the results. Until now! Algae has started to build up in the joints. It was pointed using a fairly dry sand and cement mix 4-1. When I say fairly dry, it would hold its shape when compressed but no water seeped out. The bit I did first was a little wetter but it took me ages to do so that's why I started using a dryer mix. The part done with the wetter mix is aslightly different colour but it's not too noticeable as it's near the back of my garage. This first section doesn't seem to be affected by the algae yet! Is the algae growth due to the dryer mix being slightly more porous than the wetter mix? And is there anything I can do to stop it?
Cheers
