TERMIUM Plus®
From: Translation Bureau
On social media
Consult the Government of Canada’s terminology data bank.
IMPERVIOUS LAYERS [4 records]
Record 1 - internal organization data 2013-10-16
Record 1, English
Record 1, Subject field(s)
- Roofs (Building Elements)
- Waterproofing (Construction)
Record 1, Main entry term, English
- inverted built-up roofing system
1, record 1, English, inverted%20built%2Dup%20roofing%20system
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- inverted built-up roofing 1, record 1, English, inverted%20built%2Dup%20roofing
correct
- inverted roofing 2, record 1, English, inverted%20roofing
correct
- inverted roof 3, record 1, English, inverted%20roof
correct
- upside-down roof assembly 1, record 1, English, upside%2Ddown%20roof%20assembly
correct
- upside-down roof 4, record 1, English, upside%2Ddown%20roof
correct
- protected membrane roof 5, record 1, English, protected%20membrane%20roof
correct
- PMR 5, record 1, English, PMR
correct
- PMR 5, record 1, English, PMR
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
A flat roof (sometimes referred to as an upside-down roof) in which the weatherproof membrane is under the thermal insulation and acts as a combined weathering and vapour barrier. 4, record 1, English, - inverted%20built%2Dup%20roofing%20system
Record number: 1, Textual support number: 1 CONT
Also known as upside-down roof assembly, an inverted built-up roofing system consists of several layers installed in a sequence different from the usual one in which insulation is placed below the roof deck. First, standard built-up roofing is applied directly to the deck. Then, rigid insulation that is impervious to moisture, such as extruded polystyrene foam, is bonded to the top of the built-up roofing with a mopping of steep asphalt.... 1, record 1, English, - inverted%20built%2Dup%20roofing%20system
Record 1, Key term(s)
- inverted insulation
- upside down roof
Record 1, French
Record 1, Domaine(s)
- Toitures (Éléments du bâtiment)
- Étanchéité (Construction)
Record 1, Main entry term, French
- toiture inversée
1, record 1, French, toiture%20invers%C3%A9e
correct, feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- système de toiture inversée 2, record 1, French, syst%C3%A8me%20de%20toiture%20invers%C3%A9e
correct, masculine noun
- système toiture inversée 3, record 1, French, syst%C3%A8me%20toiture%20invers%C3%A9e
correct, masculine noun
- couverture inversée 4, record 1, French, couverture%20invers%C3%A9e
feminine noun
- couverture à isolant sur étanchéité 5, record 1, French, couverture%20%C3%A0%20isolant%20sur%20%C3%A9tanch%C3%A9it%C3%A9
feminine noun
- couverture à membrane protégée 5, record 1, French, couverture%20%C3%A0%20membrane%20prot%C3%A9g%C3%A9e
feminine noun
- couverture à isolant sur membrane 6, record 1, French, couverture%20%C3%A0%20isolant%20sur%20membrane
feminine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
Isolant placé sur l'étanchéité (appelé quelques fois: "toiture inversée") - Cette disposition paraît excellente sur le plan théorique, mais elle est actuellement délicate à réaliser. 7, record 1, French, - toiture%20invers%C3%A9e
Record number: 1, Textual support number: 2 CONT
Le système toiture inversée consiste à placer le complexe d'étanchéité sous les panneaux isolants. 3, record 1, French, - toiture%20invers%C3%A9e
Record number: 1, Textual support number: 3 CONT
Si, après vérification, la stabilité de la structure reste assurée avec [une surcharge de 75 kg/m], on peut envisager le système de toiture dite "inversée" où l'isolation thermique est posée au-dessus de l'étanchéité et lestée par une couche de gravier ou un dallage (...) 2, record 1, French, - toiture%20invers%C3%A9e
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 2008-02-13
Record 2, English
Record 2, Subject field(s)
- Anti-pollution Measures
- Radioactive Contamination
- Nuclear Waste Materials
- Radiation Protection
Record 2, Main entry term, English
- containment
1, record 2, English, containment
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
- confinement 2, record 2, English, confinement
correct
Record 2, Textual support, English
Record number: 2, Textual support number: 1 DEF
The retention of radioactive material in such a way that it is effectively prevented from becoming dispersed into the environment. 3, record 2, English, - containment
Record number: 2, Textual support number: 1 CONT
... to calculate the potential of clay to provide containment, assumptions must be made regarding the homogeneity of supposedly impervious clay layers. 4, record 2, English, - containment
Record number: 2, Textual support number: 1 OBS
See also "waste containment". 2, record 2, English, - containment
Record 2, French
Record 2, Domaine(s)
- Mesures antipollution
- Pollution par radioactivité
- Déchets nucléaires
- Radioprotection
Record 2, Main entry term, French
- confinement
1, record 2, French, confinement
correct, see observation, masculine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 DEF
Ensemble des précautions prises pour empêcher la dispersion de quantités inacceptables de matières radioactives au-delà des limites déterminées, même en cas d'accident. 2, record 2, French, - confinement
Record number: 2, Textual support number: 1 CONT
Évacuation avec plus grand confinement. 3, record 2, French, - confinement
Record number: 2, Textual support number: 2 CONT
Ils [les filtres à très haute efficacité] peuvent constituer un déchet fortement actif même en condition normale d'exploitation et doivent faire l'objet d'une manipulation sous protection biologique (irradiation) éventuellement complétée par un confinement (contamination alpha) au moyen de matériels sophistiqués réalisés à cet effet. 4, record 2, French, - confinement
Record number: 2, Textual support number: 1 OBS
Le terme «confinement» désigne aussi l'ouvrage (ou le système) de confinement lui-même. 5, record 2, French, - confinement
Record number: 2, Textual support number: 1 PHR
barrière de confinement, capacité de confinement (d'un site), enceinte de confinement, enveloppe de confinement, (maintien de l') intégrité d'un (système) de confinement, matériau de confinement, rupture de (système) de confinement; passage de radionucléides à travers un confinement. 5, record 2, French, - confinement
Record number: 2, Textual support number: 2 PHR
Assurer, garantir, réaliser un confinement. 5, record 2, French, - confinement
Record number: 2, Textual support number: 3 PHR
Confinement absolu, dynamique, en formations géologiques, étanche, géologique, global, intégral, naturel, passif, sans contrôle, statique. 5, record 2, French, - confinement
Record number: 2, Textual support number: 4 PHR
Les confinements (matériaux ou systèmes) isolent les nappes phréatiques, sont susceptibles de relâcher l'activité qu'ils retiennent. 5, record 2, French, - confinement
Record number: 2, Textual support number: 5 PHR
Confinement de la contamination, de la radioactivité, des cendres d'incinération, des déchets, des gaz, des matières radioactives, des nuisances radiologiques, du combustible. 5, record 2, French, - confinement
Record 2, Spanish
Record 2, Campo(s) temático(s)
- Medidas contra la contaminación
- Contaminación por radioactividad
- Desechos nucleares
- Protección contra la radiación
Record 2, Main entry term, Spanish
- confinamiento
1, record 2, Spanish, confinamiento
correct, masculine noun
Record 2, Abbreviations, Spanish
Record 2, Synonyms, Spanish
- contención 2, record 2, Spanish, contenci%C3%B3n
feminine noun
Record 2, Textual support, Spanish
Record 3 - internal organization data 2001-09-27
Record 3, English
Record 3, Subject field(s)
- Petroleum Deposits
- Petrography
Record 3, Main entry term, English
- impervious strata
1, record 3, English, impervious%20strata
plural
Record 3, Abbreviations, English
Record 3, Synonyms, English
Record 3, Textual support, English
Record number: 3, Textual support number: 1 OBS
strata: term rarely used in the singular (stratum). 2, record 3, English, - impervious%20strata
Record 3, Key term(s)
- impervious stratum
- impervious layers
- impervious layer
Record 3, French
Record 3, Domaine(s)
- Gisements pétrolifères
- Pétrographie
Record 3, Main entry term, French
- couches imperméables
1, record 3, French, couches%20imperm%C3%A9ables
feminine noun, plural
Record 3, Abbreviations, French
Record 3, Synonyms, French
Record 3, Textual support, French
Record number: 3, Textual support number: 1 CONT
Les dépôts organiques (animaux ou végétaux) ont subi dans les couches imperméables (argileuses, par ex.) pauvres en oxygène une fermentation particulière [...] sous l'action de bactéries anaérobies. Le pétrole ainsi formé a graduellement remonté sous les actions diverses [...] 1, record 3, French, - couches%20imperm%C3%A9ables
Record 3, Key term(s)
- strates imperméables
- couches imperméables
- couche imperméable
Record 3, Spanish
Record 3, Textual support, Spanish
Record 4 - internal organization data 2001-03-28
Record 4, English
Record 4, Subject field(s)
- Water Treatment (Water Supply)
Record 4, Main entry term, English
- drainage trough
1, record 4, English, drainage%20trough
correct
Record 4, Abbreviations, English
Record 4, Synonyms, English
Record 4, Textual support, English
Record number: 4, Textual support number: 1 CONT
Three of the conventional paved rectangular drying beds with a centre drainage trough and concrete side walls were modified to meet the design criteria mentioned previously and then planted with Phragmites communis. 1, record 4, English, - drainage%20trough
Record number: 4, Textual support number: 1 OBS
Figure 1 - Cross section of a typical reed bed. 1, record 4, English, - drainage%20trough
Record number: 4, Textual support number: 2 OBS
Sludge treatment in field scale reed beds... Reed beds may be roughly categorized as rectangular beds with side walls, layers of sand and then gravel with an under drainage system to collect and carry away the filtrate. They are lined with impervious membranes and planted with the reed, Phragmites communis. 1, record 4, English, - drainage%20trough
Record 4, French
Record 4, Domaine(s)
- Traitement des eaux
Record 4, Main entry term, French
- drain
1, record 4, French, drain
correct, masculine noun
Record 4, Abbreviations, French
Record 4, Synonyms, French
- canal de drainage 2, record 4, French, canal%20de%20drainage
masculine noun
Record 4, Textual support, French
Record number: 4, Textual support number: 1 CONT
Lits de séchage. Le séchage des boues sur des lits de sable drainés, longtemps la technique la plus utilisée, est en régression [...] Les aires de séchage sont généralement ainsi constituées [...] : première couche support de gros cailloux avec une couche de graviers [...] Des drains sont aménagés au fond de cette couche support [...] Le système de drainage doit évidemment se situer au-dessus de la nappe phréatique. 1, record 4, French, - drain
Record 4, Spanish
Record 4, Textual support, Spanish
Copyright notice for the TERMIUM Plus® data bank
© Public Services and Procurement Canada, 2026
TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
A product of the Translation Bureau
Features
GCtranslate (available on the Government of Canada network only)
Use this artificial intelligence prototype to translate Government of Canada content up to and including Protected B. Available to employees of selected departments and agencies only.
Writing tools
The Language Portal’s writing tools have a new look! Easy to consult, they give you access to a wealth of information that will help you write better in English and French.
Glossaries and vocabularies
Access Translation Bureau glossaries and vocabularies.
- Date Modified:


