1. Keeping the old seal
In economic terms, it's clear that removing the old waterproofing is a costly operation that can often be avoided. Removal includes tearing out the running parts and upstands, thermal insulation and protection, cleaning and removal of rubble to the public dump. Of course, the supply and installation of a new vapour barrier must be added to this total.
In our experience, a good rainstorm can sometimes cause serious water damage on the top floor, just after the waterproofing and vapour barrier have been removed!
In conclusion: keeping the seal (if, and only if, it is possible) seems to be the most economical solution, because you :
saves on waterproofing removal costs (a truism!);
reduces construction time (time savings);...
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Keeping the old seal
Bibliography
Websites
AFNOR http://www.afnor.fr
Agence Qualité et Construction http://www.qualiteconstruction.com
Standards and norms
Unified Technical Document (DTU)
- Travaux de bâtiment. Étanchéité des toitures. - DTU 43 -
French standards
- Travaux de bâtiment. Réfection des ouvrages d'étanchéité des toitures-terrasses ou inclinées. Partie 1 : cahier des clauses techniques. Partie 2 : cahier des clauses spéciales (référence commerciale du DTU 43.5). Indice de classement : P84-208. - NF P 84-208 - 11-02
- Travaux...
Directory
Manufacturers – Suppliers – Distributors (non-exhaustive list)
Flag SpA (brand: Flagon) http://www.flag.it
Sarnafil AG (Sarnafil brand) http://www.sarnafil.ch
Siplast (brands: Adéply thin foil, Adéalu aluminum foil and Adécuivre...
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