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Seabass2500
07-25-2006, 11:28 PM
I laid this patio, 2200 sq ft, of irr Penn Blue stone. It is on 5" 411 (compacted gravel w/ dust) and 5" of re-inforced concrete. The mortar is 1/2" - 1 1/2" below stones and about 1/2" - 3/4" joints. After about 2 weeks, we are starting to see some small cracks along the seams of some of the joints. I am thinking that it may be due to the extreme heat we have been having causing the mortar to cure/dry too quickly. I am not having any of the issues with the walls though...

Let me know what you think.

Thanks.

*** Pictures ***

http://home.cinci.rr.com/cs1/picts/2006 04-19 015.jpg
http://home.cinci.rr.com/cs1/picts/R001.jpg
http://home.cinci.rr.com/cs1/picts/M003.jpg
http://home.cinci.rr.com/cs1/picts/M006.jpg
http://home.cinci.rr.com/cs1/picts/M010.jpg
http://home.cinci.rr.com/cs1/picts/R005.jpg
http://home.cinci.rr.com/cs1/picts/R003.jpg

XXL Hardscaper
07-26-2006, 04:36 PM
Nice Work !

What was your mix for the grout?

Seabass2500
07-26-2006, 08:28 PM
Thanks.

We mix about 1 part Type N mortar cement and 2 1/2 parts fine sand.

I haven't had many problems like this before is the odd thing.

XXL Hardscaper
07-27-2006, 01:40 PM
I have seen this happen from mortar drying to quick. I prefer type s at a 3 to 1 mix. Also adding a little more lime when it is really hot will help slow the cure a little by helping retain moisture longer.

Seabass2500
07-27-2006, 02:47 PM
The only way I have ever repaired a hair-line crack before was with an almost liquid mortar mixture and rub it into the crack. With joint cracks, usually bigger ones, I would grind out some of the mortar first so I could put in a healthy amount of mortar to minimize its chances of popping.

If you have any other suggestions... shout them out! :)

Thanks.

Premier_Lawn
10-16-2006, 10:38 PM
liken the microwave idea in the last picture :clapping:

Randy J
10-17-2006, 09:08 AM
Can't help much, but what an awesome job! I'd like to have that backyard.