{"id":248284,"date":"2026-09-01T08:43:44","date_gmt":"2026-09-01T07:43:44","guid":{"rendered":"https:\/\/www.marbre-import.fr\/?page_id=248284"},"modified":"2026-09-01T08:43:44","modified_gmt":"2026-09-01T07:43:44","slug":"walls-renders-substrates-facade-joints","status":"publish","type":"page","link":"https:\/\/www.marbre-import.fr\/en\/natural-stone-encyclopedia\/walls-renders-substrates-facade-joints\/","title":{"rendered":"Technical Guidance: Walls, Renders, Substrates and Fa\u00e7ade Joints"},"content":{"rendered":"

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Home<\/a> \/ Natural Stone Encyclopedia<\/a> \/ Technical Guidance: Walls, Renders, Substrates and Fa\u00e7ade Joints<\/strong><\/div>\n
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Standards and Compliance<\/p>\n

Technical Guidance: Walls, Renders, Substrates and Fa\u00e7ade Joints<\/h1>\n

Coordinate masonry, concrete, renders, sealants and stone cladding without asking the finish to perform the substrate’s function.<\/p>\n

\n Open the interactive tool<\/a>Ask a stone specialist<\/a>\n <\/div>\n<\/p><\/div>\n<\/section>\n
\"Substrate<\/a>
Substrate inspection and preparation before installation \u2014 Walls, renders, substrates and fa\u00e7ade joints<\/figcaption><\/figure>\n
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Thirty-second overview<\/h2>\n

Cladding depends on the wall that supports it. In France, NF DTU 20.1, 23.1 and 26.1 cover defined masonry, cast concrete walls and mortar renders respectively. NF DTU 44.1 addresses sealant joints in fa\u00e7ades within its stated field of application.<\/p>\n

Before installing stone, the contractor must inspect geometry, cohesion, moisture, cracks, joints, flatness and surface condition. Unresolved interfaces must not be concealed, and a primer cannot be assumed to turn a weak render into a load-bearing substrate.<\/p>\n

Movement joints require proper design and preparation, including width, depth, backing rod, joint faces, sealant, adhesion and compatibility with the stone.<\/p>\n<\/section>\n

\"Wall<\/a>
Wall substrates and fa\u00e7ade joints<\/figcaption><\/figure>\n
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Scope: when to use this guidance<\/h2>\n
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Situation<\/th>\nApplicable document or check<\/th>\nPractical decision<\/th>\n<\/tr>\n<\/thead>\n
Unit masonry<\/td>\nNF DTU 20.1<\/td>\nIdentify the substrate and expected movement<\/td>\n<\/tr>\n
Cast concrete wall<\/td>\nNF DTU 23.1<\/td>\nInspect construction joints, surface and tolerances<\/td>\n<\/tr>\n
Mortar render<\/td>\nNF DTU 26.1<\/td>\nConfirm suitability for receiving cladding<\/td>\n<\/tr>\n
Fa\u00e7ade joint<\/td>\nNF DTU 44.1<\/td>\nDesign the sealant and backing rod<\/td>\n<\/tr>\n
Waterproofing refurbishment<\/td>\nNF DTU 42.1<\/td>\nCoordinate with existing finishes<\/td>\n<\/tr>\n
Internal partition<\/td>\nNF DTU 20.13 or the proprietary system<\/td>\nVerify loads and fixing method<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n
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Wall inspection before cladding<\/h2>\n