In the principle of this demolition, it is necessary to create a metal gantry capable of supporting the descent of the load coming from the upper stage.
For this, metal profiles (a beam and two columns) are previously sized in a calculation note made by a structural design office. The supply and implementation of such a gantry require several people and adequate tools. Depending on the difficulties to be overcome, it may be wise to call on qualified and insured professionals for this type of work.
After conducting soundings to analyze the ceiling structure, place props under the beams.
Feel free to screw the props and nail them.
With a mallet and a chisel, drop the fills first to expose the structure.
Start at the top, and then go down.
If it is necessary to install metal posts to take up the beams, clear as much as possible the masonry...
In case of wooden structure, put props between the posts, under the beam.
Cut each post halfway up and remove the pieces one by one.
Once the space is released and carefully supported,
check the flatness of the wooden beam with a mason ruler and a spirit level.
After cutting to the right length, position the metal beam under the wooden one.
At the same time shore the metal beam.
Get help, this room is heavy.
Depending on the size of the metal poles, place a steel plate in the floor, in order to distribute the loads on the floor.
Measure the height between the floor plates and the beam.
Carry the measurement on each of the metal poles.
Cut the poles to the correct size with a chain saw equipped with a metal cutting disc.
Position the posts at each end of the beam.
Do not hesitate to bring them back in strength by helping you with a mallet.
Check the plumb level.
Use an arc welding machine to make a weld bead at the junctions between the poles and the metal beam.
On the ground, weld on both sides the foot of the metal pole on the steel plate.
Proceed in the same way for the other post.
Shred with the mortar of the mortar (cement and sand) until you obtain a perfectly homogeneous mixture.
After slightly moistening the soil, place mortar with a shovel.
Spread all around each post with a trowel.
As the underside of the wooden beam is not perfectly flat, insert shims into the residual spaces to consolidate the assembly.
To improve the junction between wood and metal structures, drill the metal frame and screw lag bolts into the wood whenever possible.
After drying the mortar at the foot of the posts, fill with mortar or plaster all residual interstices to block well together.