Veneered Doorsets

Interspec Doorset Performance

Fire

FD30, FD60, FD90 and FD120 certified fire doors.

Smoke Control

Fire doors are also certified for smoke control (FD30S, FD60S, FD90S, FD120S).

Durability

A range of doorsets have been tested in accordance with DD171 and EN1192 resulting in a severe duty rating.

These specify the performance requirements for hinged and pivoted doors and classifies them by strength and durability based on four categories:

Light: Private dwellings.

Medium: Offices and dwelling with higher risk of damage.

Heavy: Hospitals and public buildings.

Severe: Educational establishments.

Acoustic rated doorsets require accurate sealing and installation to achieve the desired performance.

Sound Reduction – Frequency

The number of vibrations per second expressed in Hertz:

• Low frequency (40Hz to 400Hz)
• Medium frequency (400 to 1600Hz)
• High frequency (1600Hz to 20000Hz)

Sound Pressure Level

The measurement of sound level in decibels (dB) with the sound reduction index (Rw).

Sound Reduction

The weighted sound reduction index is measured in accordance with:

• EN ISO 140.3 (measurement of sound insulation in buildings)
• EN ISO 717.1 (classification of sound insulation in buildings)

Sound Insulation

The Rw ratings are for the doorset only. Manufacturers sometimes provide sound insulation data as a combined rating for the wall and doorset. The actual Rw rating of the doorset should be calculated using a percentage of the wall area it occupies. The wall rating is generally higher than the required doorset. Please refer to the table below.

Threshold and Drop Seals

Threshold seals are necessary in order to maintain the required acoustic performance level.

A drop-down seal or wiper seals with a rubber threshold will achieve the requirement at floor level. Any acoustic performance is fully dependant on the elimination of sound penetration, the area between the wall and the back of the door frame must be fully sealed.

Interspec Doorsets offers a range of aperture styles designed to suit many applications. Additional options are available upon request. Cut outs for classified products are subject to maximum allowances in fire/sound certification.

Factory Glazing

As standard, doors are delivered glazed.

= Equality Act compliant vision panels.

= Interspec Doorset bim object available.

Glazing Bead Detail

Glazing bead is screw fixed as standard.

Glass thickness ranges from 6mm to 17mm dependant on performance.

Configurations and Sizes

The Interspec Doorset has an extensive range of configurations and styles. Regulatory compliance fit for purpose and safety are integral to the design whilst maintaining the desired aesthetic appearance and performance.

The table below outlines the standard configurations together with the basic dimensional principals of our doorset packages.

*please note a standard handle projection of 64mm is used in these calculations. For unequal pairs, the clear opening is calculated on the basis that the secondary leaf is kept locked.

Building Tolerance

All prepared openings should be equal in wall thickness at all points and plumb and square tolerances of +10/-0 in the width and +5/-0 in the height.

Dimensional Tolerances

All manufacturing processes require certain tolerances when working with natural materials that tend to move with climatic conditions. Lloyd Worrall work within the tolerances of BS4787 Pt.1 for internal and external wood doorsets, door leaves and frames.

Step-by-Step Doorset Installation Video

We’ve created a toolbox talk installation video to show how to install our Interspec Doorsets.

Frame Assembly

It is very important that doorsets are installed correctly to comply with requirements of fire, acoustics etc. It is the responsibility of the installer to ensure the correct procedures are followed. The guarantee will be void if the criteria are not met.

N.B. The jamb fixing should be fitted centrally in the doorstop as pictured above.
IMPORTANT: Hardwood frames have to be pre-drilled before fixing.

The sizes described in the Interspec timber doorset schedule indicate the overall frame size. All prepared openings should be equal in wall thickness at all points and plumb and square with tolerances of +10/-0mm in the width and +5/-0mm in the height. See Fig. A, A1 and A2.

Interspec doorsets are supplied with a moisture content of between 10% and 14%. The building should be dried out. Frames should NOT be built-in or installed as first fixings, as they are highly susceptible to intake of moisture, which will distort the frame and prevent the door from operating correctly.

For masonry walls, a template should be made to the exact opening dimensions or a timber sub-frame installed to the correct opening dimensions, square and plumb.

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Frame Fixing

Timber frames must be fixed back to either timber or stud partitions, or masonry walls, with fixings per jamb
set no greater than 250mm from corners and at centres not exceeding 600mm. See Fig. B.

Single frame head members generally to have 1 central fixing. Double frame head members to have 2 fixings. Where fitted in steel stud partitions the edge of the door opening must be filled with timber (we recommend minimum 50mm thickness) to provide stiffness and suitable fixing capacity. Behind each fixing, packers of solid fire resisting material should be applied. See Fig. B1.

Position frame in opening (if supplied with extension lining this is not required at this stage) and pack off at fixing positions across whole thickness of partition with timber packing pieces to take up tolerances and to locate frame square and plumb.

Frames should be drilled to suit plugs for 10 gauge screws in blockwork and studding.

Insert plugs into blockwork through frame fixing holes and push below surface and blockwork.

Fix frames at each fixing position with wood screw size 100mm x 10 gauge. Do not fully tighten at this stage. See Fig. B1.

Hang door leaf/leaves, adjust and tighten frame fixings using door leaf/leaves as a template until a perfect hang with correct tolerances is achieved.

The door gaps (Those between doors and the frame, and between leaves of double doors) shall be 1.5mm-3mm to contribute to the fire resistance. Gaps with smoke seals are to be 3mm. Gaps under the door should not exceed 8mm for fire resistance, although, if smoke control is required, these gaps should only be 3mm or an approved seal shall be included.

Where required position extension lining in frame groove to take up full thickness of partition and with open end flush with partition face all round. Fix securely with steel pins through door stop into tongue of extension lining.

Fix architraves at maximum 300mm centres with 30mm long steel panel pins.

Junction between door assemblies and surrounding structure

In order to maintain the fire resistance of a fire resisting wall or partition when fitted with a doorset the junction between the two elements should be adequately sealed.

Recommendations are detailed in BS 8214: 2016 for either.

a) Intumescent strip factory fitted to the back of the frame

b) Mineral wool packed to a depth of at least 10mm or

c) Intumescent paste or intumescent mastic.

d) Alternatively, other tested, assessed, or third party certificated solutions may also be utilised, using a product proven in such timber applications, and with reference to the correct depth of seal to suit the width of the gap between all and frame.