Bonding coat
The bonding coat, bond coat or base coat in construction terms usually refers to the first coat of gypsum plaster which is laid on the existing surface such as stone, brick or existing plaster. The term base coat is usually used to mean the same but for lime based plaster products or clay based plaster products. Base or bond coat can also be used to describe the first layer of external render applied directly to the existing external structure of a building such as stone or brick, though this is most often referred to as a parge coat.
The bond or base coat is usually a coarse plaster or render which can be applied in thicknesses between 10-20mm, it has greater adherence qualities and is used to even out the existing surfaces of the wall, internally in the case of plaster and externally in the case of render. Once hardened one or two more layers can be applied, finished by the final coat, finish layer, sometimes called skim coat which is normally a thinner layer applied at 2-5mm thickness.
See also: plaster, lime plaster and clay plaster
[edit] Related articles on Designing Buildings
- Boss plaster.
- Caulk.
- Cement.
- Cement mortar.
- Clay plaster.
- Daub.
- Decorative metal ceilings.
- Dry lining.
- Drywall.
- Finishes.
- Fresco.
- Grout.
- Gypsum.
- Inspecting historic fibrous plaster ceilings.
- Lath and plaster.
- Lime plaster.
- Making Magnificence: architects, stuccatori and the eighteenth-century interior.
- Mortar.
- Parge coat.
- Plaster.
- Rendering.
- Stucco.
- Tanking.
- Tiles.
Featured articles and news
Plumbing and heating systems in schools
New apprentice pay rates coming into effect in the new year
Addressing the impact of recent national minimum wage changes.
EBSSA support for the new industry competence structure
The Engineering and Building Services Skills Authority, in working group 2.
Notes from BSRIA Sustainable Futures briefing
From carbon down to the all important customer: Redefining Retrofit for Net Zero Living.
Principal Designer: A New Opportunity for Architects
ACA has launches a Principal Designer Register for architects.
A new government plan for housing and nature recovery
Exploring a new housing and infrastructure nature recovery framework.
Leveraging technology to enhance prospects for students
A case study on the significance of the Autodesk Revit certification.
Fundamental Review of Building Regulations Guidance
Announced during commons debate on the Grenfell Inquiry Phase 2 report.
CIAT responds to the updated National Planning Policy Framework
With key changes in the revised NPPF outlined.
Councils and communities highlighted for delivery of common-sense housing in planning overhaul
As government follows up with mandatory housing targets.
CIOB photographic competition final images revealed
Art of Building produces stunning images for another year.
HSE prosecutes company for putting workers at risk
Roofing company fined and its director sentenced.
Strategic restructure to transform industry competence
EBSSA becomes part of a new industry competence structure.
Major overhaul of planning committees proposed by government
Planning decisions set to be fast-tracked to tackle the housing crisis.
Industry Competence Steering Group restructure
ICSG transitions to the Industry Competence Committee (ICC) under the Building Safety Regulator (BSR).
Principal Contractor Competency Certification Scheme
CIOB PCCCS competence framework for Principal Contractors.
The CIAT Principal Designer register
Issues explained via a series of FAQs.