Preface - this house is located in China, where permits and contractor certifications are not a thing, and there is basically no legal remedy for compensation over shoddy work.
Last year we had this deck put in by a local team. The large posts (4) are 155~165mm square, and 3160 to 3310mm tall (the driveway has a minor slope). The smaller posts (2) are 80~85mm square.
This year large cracks have developed in most of the posts. The cracks are mostly 15 to 20mm in depth, but some run as deep as 50mm. They occur on multiple sides of the posts and tend to run more than half of the height of each post.
We are unable to locate the original contractor. We brought in another local last week and he said:
- they're fine, don't worry about it
- I could stick some glue in the cracks if it would make you feel better
- I guess I could put bolts through the posts if you're still not happy
I know nothing about carpentry, but I do understand frost-wedging. Our climate here features 3 to 4 months each winter continuously below 0 Celsius, so when I see those cracks I get very nervous with winter on the way.
Assuming these cracks ARE a problem, my initial reaction was that short of replacing them outright, some sort of steel banding would be a reasonable solution. I'm not keen on adding MORE holes unless the bolts are affixed to large external pressure plates but he wasn't going to do that.
Is this a problem? If not, will it become one soon?
Full album with additional photos: https://imgur.com/a/JEfrx