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reduction - part E » practical
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In order to achieve the designed acoustic performance on
site, any air gaps must be eliminated and all components
should fit as intended, as any leakage of air will reduce
effectiveness. The best way to achieve this is with fully
engineered, factory finished performance doorsets. These are
supplied with all the necessary seals fitted to either door
or frame, where necessary including astragals for pairs. Test
results are generally for single leaf doorsets and a
reduction of some 2-3 RwdB can be expected for pairs. It is
not practicable to seek useful sound reduction levels from
double action doors as these are difficult to seal at the
foot of the door.
With acoustic doors the gap between door and floor must also
be sealed with contact or wiping seals. Thresholds will also
be needed and these must be level with the door. They must
be bedded on mastic and screw-fixed direct to hard surfaces
while carpet and textured flooring should stop either side.
Low profile aluminium thresholds may be fixed on a hardwood
packer so that top of threshold is above the floor finish
again ensuring that there is a mastic seal between each
element. Gaps between back of frame and wall should be
completely packed with mineral wool and sealed both sides
with mastic to a depth of at least 10mm. Special care is
needed to check that doors close correctly all around,
noting a slight resistance when the door closes against its
seals.
The
contents of this guide represents Leaderflush Shapland's
interpretation and opinions of the documents discussed. No
responsibility or liability can be accepted for any loss or
damage arising from any error or omission contained in this
guide.
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