Sawing against the Wind
Join Date: Dec 2010
Location: God's beautiful hills of Middle Tennessee
Moisture movement/ The MC animal
This is a highly common problem that is less discussed OR at least less believed on it's strength AND change effects.
SORRY no pics at this time BUT I'll tell the story/details.....
I've had a prospective client on my waiting list just to inspect his possible job and sometime he had a structural engineer come out and inspect with ALL the long list of "problems" and "solutions". He had told me initially he had a porch structure problem and settling....mmmm nothing unusual for me to see or hear of due to most skimp solid footings and place porches on NON-compacted filled soil. Upon arrival he kept telling me the corners were falling outwards (basically a wrap around front porch 60' x 80'x 45' approximates) and the engineers were claiming settling. Upon closer investigation BOTH porch corners were away from house roughly a 1 1/2" both directions BUT everything else against the wall seemed tight (red flag)....I noticed the footer foundation was actually nice and true, it was built with the appearance they were gonna fill with stone and pour a slab on short hieght wall ( good footer, 4-5 block high down to below our frost line (red flag against engineer, NOT settling)). I noticed all the railings weren't against the posts (red flag), I noticed the joists were pulling away at each end (red flag), noticed water stains on top of decking(red flag). I finally stopped the man and said I KNOW your problem, he insisted on telling me what else the engineers report was saying and I politely said "they're wrong" and explained the problem....
The house was nice (I noticed very few corners cut and most of it was fairly quality built). The decking was a composite wood T&G (AS some guess NO moisture issues....WRONG!!!!) It was installed too tightly and zero slope...AFTER explaining and questioning the install procedures I found out they didn't put the quarter(coin) thickness spacing between them BUT had put a GOOD screw in the face and it DIDN'T buckle when MC increased...it literally pushed joists ends apart, railings loose, the corners pyramided out 1 1/2 to 2" at tips.
POINT stated as I've MANY times explained here MOISTURE / MC is a animal, it CAN be tamed and controlled BUT it has to be done correctly!!! This project will be overly expensive MOSTLY due to lack of a spacing/expansion room. 2000 sq ft of porch decks.
Have a Blessed and Prosperous day in Jesus's Awesome Love, Tim
........www.TSMFarms.com.......... John 3:16-21 ..........
Reveling God's awesome beauty while creating one of-a-kind flitches and heirlooms.