{"id":248464,"date":"2026-09-01T08:38:31","date_gmt":"2026-09-01T07:38:31","guid":{"rendered":"https:\/\/www.marbre-import.fr\/?page_id=248464"},"modified":"2026-09-01T08:38:31","modified_gmt":"2026-09-01T07:38:31","slug":"france-cstb-renovation-flowing-screeds-wet-area-systems","status":"publish","type":"page","link":"https:\/\/www.marbre-import.fr\/en\/natural-stone-encyclopedia\/france-cstb-renovation-flowing-screeds-wet-area-systems\/","title":{"rendered":"France: CSTB Guidance, Renovation, Flowing Screeds and Wet-Area Systems"},"content":{"rendered":"

[et_pb_section fb_built=”1″ _builder_version=”4.27.4″ custom_padding=”0px|0px|0px|0px|false|false”][et_pb_row _builder_version=”4.27.4″ width=”100%” max_width=”100%” custom_padding=”0px|0px|0px|0px|false|false”][et_pb_column type=”4_4″ _builder_version=”4.27.4″][et_pb_text _builder_version=”4.27.4″]

<\/p>\n
Home<\/a> \/ Natural Stone Encyclopedia<\/a> \/ France: CSTB Guidance, Renovation, Flowing Screeds and Wet-Area Systems<\/strong><\/div>\n
\n
\n

French regulatory guidance<\/p>\n

France: CSTB Guidance, Renovation, Flowing Screeds and Wet-Area Systems<\/h1>\n

Navigate French CSTB technical guidance for renovation substrates, flowing screeds, waterproofing beneath finishes and systems outside traditional NF DTU scope.<\/p>\n

Request expert advice<\/a>View available stone<\/a><\/div>\n<\/div>\n<\/section>\n
\"Assessment<\/a>
Assessment of renovation substrates, screeds and wet-area systems in France<\/figcaption><\/figure>\n
\n
\n

Why additional French documents exist<\/h2>\n

NF DTU documents do not cover every modern product or substrate. CSTB specifications, technical assessments and system documents define conditions for particular solutions.<\/p>\n

Identify the exact product, current document and project use; do not apply one system\u2019s detail to another.<\/p>\n<\/section>\n

\n

Renovation over existing finishes<\/h2>\n

Existing tiles or stone require checks for adhesion, cracks, contamination, flatness and movement. Weak layers must be removed; cleaning and primers follow the approved system.<\/p>\n

Covering a defect does not stabilise the substrate.<\/p>\n<\/section>\n

\n

Flowing screeds<\/h2>\n

Calcium sulphate and cement-based flowing screeds have different preparation, moisture and heating requirements. Surface laitance and residual moisture must be managed according to the screed and finish system.<\/p>\n

Record commissioning of heated floors and measurement results.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Situation<\/th>\nRequired evidence<\/th>\n<\/tr>\n<\/thead>\n
Existing finish<\/td>\nSoundness, cleaning and primer compatibility<\/td>\n<\/tr>\n
Flowing screed<\/td>\nType, moisture, sanding and heating record<\/td>\n<\/tr>\n
Wet-area membrane<\/td>\nSystem approval and continuous details<\/td>\n<\/tr>\n
Large-format stone<\/td>\nScope, flatness and adhesive method<\/td>\n<\/tr>\n
Crack treatment<\/td>\nMovement diagnosis and approved solution<\/td>\n<\/tr>\n
Non-standard build-up<\/td>\nTechnical assessment and clear responsibility<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n
\n

SPEC and wet-area protection<\/h2>\n

French SPEC systems protect defined water-exposed walls and floors beneath finishes. They are not interchangeable with structural waterproofing or pool systems.<\/p>\n

Corners, drains, penetrations and thresholds must use the complete documented detail.<\/p>\n<\/section>\n

\n

International project coordination<\/h2>\n

These documents are specific to work in France. Translate requirements for international stakeholders but retain official French references and editions in the contract file.<\/p>\n

Use qualified French designers and contractors to confirm scope and responsibility.<\/p>\n<\/section>\n

\n

Need advice for a real project?<\/h2>\n

Marble Import supports international homeowners, architects and interior designers with stone selection, samples, technical feasibility and coordination of high-end stonework in France and across Europe.<\/p>\n

Request a quotation<\/a>Contact our team<\/a><\/div>\n<\/section>\n<\/div>\n
\n

Related natural-stone guides and services<\/h2>\n

Continue with the technical guides and project resources most closely connected with this subject.<\/p>\n

Marble and natural stone specialist in France<\/a>Natural Stone Encyclopedia<\/a>Contact Marbre Import<\/a>Marble and Natural-Stone Glossary<\/a>Substrates, Screeds, Levelling and Residual Moisture Before Stone Installation<\/a>Waterproofing Beneath Stone in Showers, Hammams and Critical Junctions<\/a>Natural-Stone Installation: Methods, Joints and Quality Control<\/a>French Stonework Rules: Laws, Standards, NF DTU and Responsibilities<\/a>France: NF DTU 52.1 and Mortar-Bed Natural-Stone Installation<\/a>France: NF DTU 52.2 and Adhesive-Fixed Natural Stone<\/a>Read the natural-stone blog<\/a>Natural stone for private clients<\/a>Resources for architects and professionals<\/a>Request a project quotation<\/a>Browse available marble and natural stone<\/a>Independent natural-stone consulting<\/a><\/div>\n<\/section>\n

<\/main>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"

English guidance to French CSTB documents for renovation substrates, flowing screeds, wet-area protection and assessed installation systems.<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":248269,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","_uag_custom_page_level_css":"","footnotes":""},"class_list":["post-248464","page","type-page","status-publish","hentry"],"acf":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"et-pb-post-main-image":false,"et-pb-post-main-image-fullwidth":false,"et-pb-portfolio-image":false,"et-pb-portfolio-module-image":false,"et-pb-portfolio-image-single":false,"et-pb-gallery-module-image-portrait":false,"et-pb-post-main-image-fullwidth-large":false,"et-pb-image--responsive--desktop":false,"et-pb-image--responsive--tablet":false,"et-pb-image--responsive--phone":false},"uagb_author_info":{"display_name":"Nicolas Roudey","author_link":"https:\/\/www.marbre-import.fr\/en\/author\/qe0jqt2016ines\/"},"uagb_comment_info":0,"uagb_excerpt":"English guidance to French CSTB documents for renovation substrates, flowing screeds, wet-area protection and assessed installation systems.","_links":{"self":[{"href":"https:\/\/www.marbre-import.fr\/en\/wp-json\/wp\/v2\/pages\/248464","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.marbre-import.fr\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.marbre-import.fr\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.marbre-import.fr\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.marbre-import.fr\/en\/wp-json\/wp\/v2\/comments?post=248464"}],"version-history":[{"count":2,"href":"https:\/\/www.marbre-import.fr\/en\/wp-json\/wp\/v2\/pages\/248464\/revisions"}],"predecessor-version":[{"id":248728,"href":"https:\/\/www.marbre-import.fr\/en\/wp-json\/wp\/v2\/pages\/248464\/revisions\/248728"}],"up":[{"embeddable":true,"href":"https:\/\/www.marbre-import.fr\/en\/wp-json\/wp\/v2\/pages\/248269"}],"wp:attachment":[{"href":"https:\/\/www.marbre-import.fr\/en\/wp-json\/wp\/v2\/media?parent=248464"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}