We discovered a crack in the 10 cm thick partition block-wall between the bathroom and walk-in closet next to the bedroom. Under this wall, pouring the concrete top layer for the floor, we brought in extra rebar for reinforcement. We also made reinforced concrete lintels above the doors and made a calculation for the weight of walls on the concrete prestressed hollow-core slap floor elements.
The crack can have different causes. Expansion because of our high temperatures can be one, because of the difference of expansion coefficients of the blocks in relation to the concrete lintels. Shrinkage can be another thing. Also slight deflection of the floor can be a cause because the top (pressure) layer is not finished yet.
We wanted to make the ceilings in our bedroom, bathroom, guest toilet and storage a bit higher. For that we need to add one more layer of block masonry extra. So also a bit more weight.
To be the best as possible prepared not to get cracks in the tiles of the bathrooms and in the plasterwork, we decided to strengthen at three places and compartments under the floor the foundation of the hollow core slab floor elements where the walls are placed.
I can tell you, not an easy job.
It asked creativity and digging deep into my former constructional engineering "How to repair or strengthen foundations" lessons. And yes, a couple of weeks ago in the night, my mind came with a solution how to deal.
At these places we created a 20 cm thick reinforced concrete base. Happy we have our private concrete mixer.
On top of that, 15 cm thick and 20 cm high, load bearing Q-con G4 wall blocks to support and strengthen the hollow core slab floor elements.
To get pressure on the foundation we cut the the top blocks in a wedge. With a heavy rubber hammer we put them, in special block glue, in place. In between the top blocks and the floor elements a tar-foil against possible moisture to 'climb' into the floor. Actually as we did all around before placing the floor elements.
Working in the crawl space is not really my thing. Happy we installed water proof electricity and lights before and we created a work height of around 70 cm. We also put some ventilation in and still, before entering to work, mechanically ventilated extra to be sure for enough oxygen to work safe (my fire-brigade experience).
I working in the crawl space, Phatsamon, directly at the entrance outside, stand-by and in contact.
Opening the entrance of this space after about a year showed the construction in good order. The tar coating on the back side of the foundation blocks is doing a great job as well as the drains we installed to get rid of possible water during the rainy season.
My son warned me against snakes and scorpions in that space because for them it's a very nice place to stay. So we needed to check first.
Opening the entrance nearly immediately our (hunter dog) Cupid jumped under the floor and walked all around the different compartments to check for me if it was safe to work. Not a single animal (only Cupid) to find.
During my work she also joined me the whole time.
Phatsamon, this morning, first helped her sister and brother in law with turning the rice to dry on our new road. After her activities we finished the foundation job.
Time to go on 'upstairs' again. Put an extra layer of blocks for the inside walls, repair the crack, and go on with preparing for tiling and plastering. Happy we managed to finish this job this morning.
Phatsamon early in the morning helping to dry the rice on the new concrete road before doing construction work. |
Frans & Phatsamon