Soakers
and step flashings are used to weather a raking abutment where the roof is
covered with slates or plain tiles. While Code 3 is suitable for soakers, Code 4
is the minimum thickness to use for all flashings.
SOAKERS & STEP FLASHING
Soakers
and step flashings are used to weather a raking abutment where the roof is
covered with slates or plain tiles. While Code 3 is suitable for soakers, Code 4
is the minimum thickness to use for all flashings.
Soakers
weather between the wall and the roof covering. Soaker lengths vary with the
types of slates or tiles used. Diagram 5.
Minimum
upstand is 75mm and flashing
should exceed 1.5m in length and an allowance must be made when measuring for
over-lapping not less than 100mm as shown in Diagram7.
Point all flashings with Lead Sheet Sealant.
STEP AND COVER FLASHINGS
This
flashing in minimum Code 4 lead sheet is prepared and fixed as described and
shown for step flashings over soakers but with an additional allowance of 150mm
to cover over the tiles. This will make an overall girth of not less than 300mm.
Diagram 8. In all cases the free edges of the flashings should be clipped to
suit the exposure.
SINGLE
STEP ABUTMENT FLASHINGS
Single
Step flashings are particularly suitable for weathering the abutments to stone
walls but they are also used on brick abutments in exposed positions. In these
situations the vulnerable point on a step flashing (where the raking cut meets
the turn-in) is over-come by lapping the steps 50mm. Diagram 9a. Note that the
upstands of the cover flashings are not wedged into the wall but are retained by
turning the top edge of the lead over the tile. Diagram 9b. For pitches over 30°
extra fixings will be required in the top of each piece as shown in diagram 9a.