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Drain protection under buildings – granular filling
3.9NI-wide·Technical Booklet N Drainage
A drain which runs under a building should be surrounded by at least 100 mm of granular or other flexible filling.
drainagestructuralprotection-from-fallingDrain penetration through walls or foundations
3.9NI-wide·Technical Booklet N Drainage
A drain which passes through a wall or foundation should either – (a) pass through an opening giving at least 50 mm clearance all round as shown in Diagram 3.6(a); or (b) be built in with, on each sid
drainagestructuralDrain protection where lower than building foundations – trench within 1 m
3.10NI-wide·Technical Booklet N Drainage
A drain which is at a level lower than the foundations of a building should either – (a) where the trench is within 1 m of the foundations, be filled with concrete up to the level of the underside of
drainagestructuralDrain protection where lower than building foundations – trench more than 1 m away
3.10NI-wide·Technical Booklet N Drainage
(b) where the trench is more than 1 m from the foundations, be filled with concrete to a level, below the level of the underside of the foundations, equal to the distance from the foundations less 150
drainagestructuralConcrete surround requirements for flexible pipes
3.10NI-wide·Technical Booklet N Drainage
Flexible pipes should be wrapped in polythene before surrounding in concrete. The minimum thickness of the concrete surround should be 150 mm or the diameter of the pipe whichever is the greater.
drainagestructuralSpecialist advice for drains under foundations, pile-supported, or unstable ground
3.10NI-wide·Technical Booklet N Drainage
Where a drain is to pass under a foundation, be supported on piles, or where the ground is unstable, specialist advice should be sought on the protective measures needed.
drainagestructuralSpecial protection – surcharging
3.11NI-wide·Technical Booklet N Drainage
Where a drain is liable to surcharge, protective measures as described in BS EN 752 and BS 8301 should be used.
drainagestructural