Building Construction Handbook, Eighth Edition

cavity wall

insulated as required

stepped cavity

tray/dpc

weep hole

air brick dpc

sealed joint

screed

insulation

LDPE

membrane

min. 1200

gauge (0. 3 mm)

Suspended concrete floor PASSIVE

pre-cast

reinforced

concrete

floor

min.

150 mm

LDPE

membrane

finished

slab level

reinforced

concrete slab

Solid floor

(2 possibilities)

damp and gas

proof membrane

vent outlet

above eaves

vent riser

if trench

paved over

granular

trench

sub-floor

vent pipe

min. 200 mm

granular layer

EPS profiled matting

heights ... 80, 100, 150

& 200 mm

reinforced concrete slab ACTIVE

LDPE membrane paving slab

perforated bricks

granular fill

void

110 mm

uPVC

extract

duct

fan

sump centrally

located

Gas Resistant Construction