• Ultra Lightweight Aggregate Masonry Units
• Available in Solid format
• Excellent key for plastering/rendering/ drylining
• Low Dry Shrinkage
• Easy to work, cut and chase
• Fire Resistance Euroclass A1 ISO 1182
• High Thermal Insulating Performance
• Unit Weight less than 20 KG HSE Guidelines on continuous manual handling
• Manufactured to BS EN 771-3 and Associated Test Standards

• Outer and Inner leaves of cavity walls with applicable insulating material
• Internal partition walls, loadbearing or non-loadbearing, solid units at 3.6N/mm2 & 7.3N/mm2 strength (see physical properties for density required)
• Inner leaf of external walls below DPC (BS 5628: Part 3: 2001)
• Infill units for use in conjunction with concrete beam floors

Format and Size
Available in solid format
Facework size is 440mm x 215mm
Tolerances as EN 771-3 Table 1. EN 772-16 Category D1.
Unit Length and Height mm +3 -5
Unit Width average mm +3 -5
Physical Properties
Relationship of Density / Strength approx
(Solid Units)
EN 772-13 Gross Dry Density
3.6N/mm2 850 kg/m3
7.3N/mm2 900 kg/m3

Design Properties

Weight (per unit)


Modules of Elasticity
Static modulus of Interlyte-Ultra is approximately 3 to 8 kN/mm2

Water Vapour Permeability
EN1745: 2002. Table 3. Water vapour diffusion coefficiency μ 5/15.

Moisture Movement
As tested to BS EN 772-14 : 2002
Total movement = 0.56 mm/m

Water Absorption by Capillarity
Test method EN 772-11 - No performance determined

Durability against freeze thaw
No performance determined - not to be exposed

Shear Bond Strength
Declared Value 0.15N/mm2 BS EN 998-2 Annex C

Thermal Movement
Coefficients of linear expansion is 10x10- 6/0 c

Thermal Conductivity (StandardValues)
Based on C.I.B.S.E. guide book A 1999 'K’ value



Thermal Resistance
at 3% Moisture Content 'R’m2 k/w



Sound Reduction (RW) Values
(Data based on Mass Law)
The frequency range is 100-3150 Hz



Fire Resistance
Interlyte-Ultra are classified as Euroclass A1 as defined in EN ISO 1182



SITEWORK

Cutting, Chasing, Fixing
Cutting by mechanical means is recommended, thus reducing wastage and achieving a
good well-bonded wall with nominal dimensioned joint work. Chasing masonry units is laborious, however is permissible to the limits set in BS 5628: Part 3. Clause 19.6 and
should be carried out using mechanical means with depth guides. Where walls are
plastered or drylined, surface fixed plastic conduit strips are recommended. For heavy cantilevered load fixings it is recommended that 'chemical fixings’ should be used.

Delivery Load Data



Prices quoted per 10 blocks (9.88 m2). All prices include mechanical off loading and apply
to full loads. 15 tonne loads available with additional surcharge. Part loads are subject to special quotation. Interlyte-Ultra units are not considered suitable for party wall
application. For guidance in which units can be used out of the Interfuse range contact our Technical Department or visit our website on www.interfuseblocks.com.
All U' Values must be calculated using the calculation method BS EN ISO6946.

FINISHES
Internal Finishes
Plaster/Painting/Dry Lining

Lightweight Plaster, British Gypsum Carlite Browning backing coat, 10mm thickness a
setting coat of Carlite Finishing Plaster 2-3mm thickness. Dense Plaster backing coat
of 1:1:6 cement, lime, sand, 10mm with a setting coat of gypsum plaster, sirapite or
similar, alternatively British Gypsums Hardwall Plaster. Apply proprietary plaster in
accordance with manufacturers instructions.
Dry lining, all Gypsum wallboards fixed either with conventional dabs or screw fixed to
metal firings in accordance with manufacturers instructions.

EXTERNAL FINISHES
Rendering, the surface must be treated with a spatterdash coat of 1:1 cement and sand,
allow to dry white hard. Apply a backing coat of 1:1:6 cement, lime, sand ruled out and
scratched 10mm thick, a finishing coat of the same mix 5mm thick finished with a wood
float, which could have a colour additive, completes the finish.

Quality Control
Interfuse Ltd operate a formalised QA system at both Syston and Gainsborough plants.
All masonry units are subject to stringent quality control checks and are tested daily in
our own laboratory.
A documented factory production control system is in operation with regular checks made
on raw materials, production and finished units. A stock control system is in operation
with written procedures for non-conforming products. All products are produced to the
current European Standards.

Marking
Each pack is marked for traceability of product and unit clarification as given on the
delivery ticket.