Complete repair of the exterior envelope of your building, replacement of sills, lintels and shelf angles, waterproofing of walls and restoration of facades. We protect your investment before water damage does.


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The building envelope is the first line of defense against water, frost, and wind. When it fails, problems quickly accumulate: infiltrations, molds, loss of energy efficiency, structural degradation.
We work on all components of the masonry envelope: complete facades, window spills, steel lintels, corner angles, flashings and caulking joints. Each intervention is planned to address the problem at the source, not just on the surface.
RBQ certified, a CCQ and AEMQ member, MBNL coordinates the complete repair of your envelope with more than 20 years of experience. A single point of contact, work guaranteed.
Our expertise comes from the largest commercial projects in Quebec.
Formed directly by the founders of the AEMQ. Same standards.
The only license that authorizes work on stone. The majority of foundation contractors only hold the concrete license.
Our construction site decisions are based on materials science.
Each era of construction, each type of brick, each local regulation.
Free on-site inspection. We tell you what we see, not what we want to sell.
Yes. We carry out envelope repair work on residential and commercial buildings. Commercial sites benefit from the same technical rigor, the same site supervision and the same written guarantee than residential construction sites.
Yes. Replacing cracked spandrels, degraded lintels, and rusty angles eliminates thermal bridges and air infiltration routes that increase heating costs. A healthy and watertight envelope contributes directly to a better energy performance of the building. Contact us at 438.225.2169 for a free inspection of your envelope.
Envelope repair covers all work aimed at restoring or replacing the exterior components of a building that ensure its watertightness and structural strength. This includes in particular the replacement of Alleges (panels under the windows), lintels (load-bearing elements above the openings) and Angles (metal supports of the first rows of brick). These elements, which are often overlooked, are crucial in preventing water ingress and maintaining the integrity of the wall.
Plusieurs signes indiquent que l'enveloppe doit être inspectée : infiltrations d'eau aux fenêtres, fissures autour des ouvertures, linteaux corrodés ou déformés, briques fissurées en couronnement de fenêtres ou de portes, et cornières rouillées visibles. Notre équipe effectue un diagnostic complet sur place sous 48 heures pour évaluer l'état des composantes et vous recommander les travaux prioritaires.
Call us at 438.225.2169 or fill out the form on our site. Our team moves under 48 hours to inspect the condition of the spandrels, lintels and angles of your building. You then receive a detailed quotation within 24 hours with priority work, schedule and guarantees. The diagnosis is free and without commitment.
The duration varies according to the extent of the work. The precise schedule is indicated in your quote, provided under 24 hours after diagnosis. A targeted intervention on the lintels or angles of a duplex can be completed in a few days; a complete renovation of a multi-unit building can take several weeks.
The envelope of your building ensures the watertightness, insulation and durability of the structure. MBNL inspects, diagnoses, and fixes weaknesses. Request a complete evaluation of your envelope.
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