Do conservatories need cavity trays?
‘As a rule of thumb trays will be necessary, unless the addition is exempt. Conservatories have departed from the original dictionary definition of a glazed housing for plants and are now commonly used as extensions of the living space, so it makes sense to regularise the construction integrity’.
Are cavity trays a building regulations?
Cavity trays are a requirement in modern day construction. They prevent any accumulation of moisture in the cavity from travelling along the lintel and in to the Internal envelope of the building.
Do cavity trays work?
They are lightweight, simple to install and long-lasting solutions to the prevention of damp from penetrating below the roof line. This works by stepping up between the outer and inner leaves, to form a gutter which leads to a weep vent in the outer leaf.
Do conservatories need damp proofing?
The conservatory floor should have a damp proof membrane that is linked to the horizontal DPC. If there is a requirement for a gas membrane to be provided to the main house, it should be added to the conservatory subfloor as well to form continuous barrier protection to the occupants.
What are cavity trays made of?
Cavity trays can be formed using a pliable material such as lead, but more commonly they are pre-formed, with a wide range of shapes allowing for different cavity widths, corners, stop ends, steps, lintel shapes, arch shapes and sometimes incorporating external flashing.
Do you need cavity trays with rendered walls?
∎ N HBC Standards Chapter 6.11 ‘Render’ provides guidance on the provision of weepholes in rendered walls. Cavity trays with stop ends are required over all openings. Weepholes are required where render is returned back onto the window/door frame at the head of an opening.
Can I use DPC as a cavity tray?
High Bond DPC can be used for cavity tray applications including parapet walls, beneath copings and cappings. High load DPC should be used where it will be subject to a full storey of masonry. At complicated junctions, clear drawings and the design should be provided, and preformed cavity trays used.
How do you damp proof a conservatory?
Can you retrofit a cavity tray?
Type E cavity trays are beneficial for retrofitting projects as they only require one course of bricks to be removed, which saves time, disturbance of the building structure, and costs.