- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
Last edited 10 Sep 2020
If a damp-proof membrane (DPM) is to be placed above it, the blinding will help prevent it from becoming damaged by the hardcore. If a damp-proof membrane is not being laid directly above the blinding, the blinding instead provides a sturdy surface on which reinforcement for a concrete floor or raft foundation can be positioned, it prevents the concrete from seeping down into the hardcore, and it reduces the amount of moisture penetrating up into the concrete.
The concrete used for blinding is weak compared with structural concrete, and can withstand lower loading. If necessary, steel mats can be used to reinforce either the entire blinding layer or the specific areas of high loading.
NB Culvert, screen and outfall manual, (CIRIA C786) published by CIRIA in 2019, defines blinding as: ‘A temporary accumulation of impermeable debris on the lower part of a screen that creates a ‘weir’ effect, reducing the flow area and increasing upstream water levels. Preferred term is variable blockage.’ Where a screen is: ‘An arrangement of bars, grids or poles placed in a watercourse.’
 Related articles on Designing Buildings Wiki
Featured articles and news
Creating comfortable climates despite extreme temperatures.
Study examines how adjustable arrangements can succeed.
Government announces plans to improve accessibility.
Resource addresses pandemic-related NEC4 contract issues.
Incorporating EDI into the provision of fair access.
Government announces global innovation strategy.
An architectural biography. Book review.
The house where the future king of France lived.
The teacher, architectural technologist and mum offers her insights.
Careful planning needed as supply chain issues continue.
The sensitive conversion of a neglected Cornwall structure.
Plan stresses local involvement in city, town and village development.