SCHEDULE 1SPECIFICATIONS FOR INSULATION WORK
PART II
Conditions relating to insulation works5
1
Two eligible rooms, without combustion appliances, may be treated as a single room for ventilation purposes if there is an area of permanent opening between them equal to at least one-twentieth of the combined floor areas of the two rooms.
2
An eligible room may be ventilated though an adjoining room where—
a
the adjoining room is a conservatory or similar room which has not been insulated; and
b
there is an opening (which may be capable of being closed) between the eligible room and the adjoining room with an area equal to not less than one-twentieth of the combined floor areas of the two rooms; and
c
for rapid ventilation there are one or more ventilation openings to the external air in the adjoining room, having a total area equal to at least one-twentieth of the combined floor areas of the two rooms, and with some part of each ventilation opening being at least 1.75 metres above floor level; and
d
for background ventilation there are ventilation openings to the external air in the adjoining room, and between the two rooms, each opening having a total area of not less than 4,000 square millimetres, and being located so as to avoid undue draughts.
3
Any combustion appliance should either be room-sealed or the room or space containing it should have a ventilation opening of a type required by paragraph 3. If this opening is to an adjoining room or space then such room or space should have an opening of the same size direct to external air. Ventilation openings should not be located in fire-resisting walls or otherwise breach the requirements of paragraph B3 of Schedule 1 to the Building Regulations 199110.
4
Where a room to be insulated contains only a room-sealed appliance or no combustion appliance, the air path through the ventilator system or the vent may be made capable of being easily closed by a suitable means readily accessible within the room, if in all other respects, including standard of construction and installation, the combined ventilator system or vent when open to the maximum extent conforms to the standards of ventilation and acoustic performance specified in paragraphs 8 or 9 as appropriate and, whether opened or closed, meets the requirements for electrical and fire safety referred to in paragraph 8(e) or 9(4) as appropriate.
5
If desired by the claimant, a double-glazed window may be installed in place of the double window required by paragraph 2(a), whether or not the standard of acoustic performance provided by such a double-glazed window is comparable to that provided by the window specified in paragraph 6, but grant shall be payable only up to a maximum of the cost of the work specified in paragraph 6.
6
The insulation works may consist of, or include, items different from those specified in paragraph 2 where the standards of ventilation (including air admitted for the purpose of combustion) and acoustic performance provided by such items are not less than those which would have been provided by items specified in paragraph 2, except where paragraph 5(5) or 6(g) applies.
7
Where any item or part of any item is provided otherwise than under these Regulations and complies with relevant specifications in this Schedule, it shall not be required to be duplicated as a condition for payment of a grant under these Regulations.
8
Any installation of glazing in windows or doors shall comply with British Standard recommendations on safety published under reference numbers BS 6262:1982 and BS 6262, part 4: 1994.
9
Where insulation works consist of or include items described in paragraph 6(g), grant only shall be payable, up to a maximum of the cost of glass specified in paragraph 6(b).