On the roofs of the houses, any damage or non-uniform signs (swelling) in the plaster must be treated carefully, repairing the damage in depth, after we have previously found the cause of the problem.
The possible cause of the problem is the corrosion of the slab reinforcement resulting in the carbonation of its concrete. More simply, the rust created in the slab reinforcement weakened the consistency of the concrete that covered them, causing detachment and non-uniformity in the final surface.
The solution to this problem is to open the crack and repair it with suitable materials. Open the crack in depth with a special spatula. If the steel reinforcement is visible, we must apply an anti-corrosion primer, before proceeding to the repair and then to apply repair mortars which are suitable for such structural repairs.
Crack drilling & cleaning
Check the crack and drill deep until a solid substrate is found. Remove loose and dust. When we find steel reinforcement, we proceed to the good cleaning of it from rust and other loose and harmful particles and to the subsequent application of the brushable primer M STEEL by MARMOLINE, completely covering the reinforcement. It is also used as a bonding layer between the old and the new mortar layer, which will follow.
Application of repair concrete.
Then, after the application of the reinforcement primer, we apply the thixotropic concrete structural repair mortar, THIXOCRETE R4 locally up to 4cm.
We proceed with the application, after each part of old concrete has been removed by mechanical methods or by hand (water throwing, sandblasting, etc.), ensuring the necessary roughness of the surface to be repaired.
In a clean container, first add the minimum amount of water and mixing at low speed, gradually add the mortar until a homogeneous and lump-free mixture is achieved. Let it rest for 2-3 minutes and stir again. The application of the mortar is done with a trowel or by spraying with a suitable mortar machine.
Surface finishing can begin when the mortar has begun to dry.
In some cases, it may be necessary to proceed with the complete dismantling of the plaster, if this is necessary. Prime the surface with the quartz primer MAMOLINE PRO CONTACT using a roller. Then we apply the first coat plaster of MARMOLINE SV 1 in thickness up to 4mm.
We proceed to the final plaster of the surface by applying either the fine-grained plaster of one layer MARMOLINE SV 60 or MARMOLINE BP 115 or the ultra-white MARMOLINE SV 100.