Traditional Construction †
checked rebates or recesses
in masonry solid walls were
often provided at openings
to accommodate door and
window frames. This detail
was used as a means to
complement frame retention
and prevent weather
intrusion.
Exposure Zones † checked reveal treatment is now required mainly
where wind-driven rain will have most impact. This is primarily in
the south west and west coast areas of the British Isles, plus some
isolated inland parts that will be identified by their respective local
authorities.
Typical Checked Opening Details †
Ref. Building Regulations, Approved Document C. Section 5: Walls.
Driving rain exposure zones 3 and 4.
Opening Details---Checked Head, Jamb and Sill