Internal and external doors - Definitions help!

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11 Jan 2006
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I am about to install a set of french doors between my house and newly built conservatory. The council has specified they must be an external quality door.

The thing is there are some perfect doors at B&Q but they state they are internal doors, but what is the difference? Is there a certain spec a door must be or something to qualify it as an external door? :?:
 
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interior doors are sometimes thinner and less sturdy,leaving them prone to damp penetration and a security risk.
hence the fact they are cheaper.
 
The relevant section of Part L of the Building Regs is:

Conservatories
1.58 For the purposes of the guidance in Part
L, a conservatory has not less than threequarters
of the area of its roof and not less
than one half of the area of its external walls
made of translucent material.
1.59 When a conservatory is attached to and
built as part of a new dwelling:
a) Where there is no separation between the
conservatory and the dwelling, the
conservatory should be treated as an integral
part of the dwelling;
b) Where there is separation between the
conservatory and the dwelling, energy savings
can be achieved if the conservatory is not
heated. If fixed heating installations are
proposed, however, they should have their own
separate temperature and on/off controls.
1.60 When a conservatory is attached to an
existing dwelling and an opening is enlarged or
newly created as a material alteration,
reasonable provision should be made to
enable the heat loss from the dwelling to be
limited. Ways of meeting the requirement
would be:
a) to retain the existing separation where the
opening is not to be enlarged; or
b) to provide separation as or equivalent to
windows and doors having the average U-value
given in Table 1 where the opening is to be
newly created or enlarged.
1.61 For the purposes of satisfying the
requirements for the conservation of fuel and
power, separation between a dwelling and a
conservatory means:
a) Separating walls and floors insulated to at
least the same degree as the exposed walls
and floors;
b) Separating windows and doors with the
same U-value and draught-stripping provisions
as the exposed windows and doors elsewhere
in the dwelling.
1.62 Attention is drawn to the safety
requirements of Part N of the Building
Regulations regarding conservatory glazing.
 

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