Natural Hydraulic
Lime - Secil
| Secil
NHLs have been available since 1891 and have made a huge contribution
to the construction market in Portugal. Secil and Mike Wye &
Associates have joined forces to provide Portuguese natural
hydraulic limes to the UK. |
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We believe these will offer an excellent and cost effective
option for those wanting to use powdered hydraulic limes in
their work, particularly for the ever growing limecrete market
where NHL5 is widely used. Secil
NHL5 is fast setting and ideal for limecrete floors whether
used with sand aggregates or insulating aggregate such as
'light expanded clay aggregate'. The Secil NHL has a similar
strength to the French NHLs.
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For NHL brochure
(PDF format) click
here For product sheet (PDF format) click
here For Health and Safety Sheet (PDF format) click
here
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Secil NHL5 Click
here for technical sheet.
Normally used for flooring such as limecrete floors or for highly
exposed situations such as chimney flaunching etc. |
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Category
|
Unit
|
less
than 40 bags
|
40
bag pallet
|
48
bag pallet
|
|
NHL5
|
25kg
|
£7.50
|
£7.30
|
£7.20
|
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Lightweight
insulating clay aggregate
The
expanded clay aggregate consists of lightweight, porous, ceramic
granules formed by expanding special clays at high temperatures.
The coated version of the aggregate is free-draining and has negative
capillary action, good load-bearing properties and good thermal
qualities (k = 0.11 w/mk), and is used as an insulating layer below
the limecrete slab. The uncoated aggregate is mixed with NHL to
form a limecrete slab - we recommend Secil NHL5 for this slab.
| |
50
litre bags |
Bulk
bags |
| BAG
PRICE |
40
bag Pallet/per bag |
WEIGHT
guide only |
1.2m3 |
Weight
guide only |
2m3 |
Weight
guide only |
|
Clay
aggregate
20 - 0mm
|
£6.30 |
£5.54 |
22
kg |
£78.25
|
570
kg
|
£130.41 |
750-950
kg
|
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Clay
aggregate
20 - 10mm
|
£6.30 |
£5.65 |
22
kg |
£82.59
|
500
kg
|
£141.28 |
700-900
kg
|
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Coated
clay insulation
20 - 10mm
|
£6.52 |
£5.76 |
22
kg |
£82.59 |
500
kg
|
£141.28 |
1000
kg
|
Bulk discounts
are available for 10 plus bags of 1.2 cu.m or 2 cu.m sizes. Bulk
discounts for multiple pallets of bags are 2-3 pallets = 5%, 4 or
more pallets = 10% - Clay
aggregate can be supplied in loose bulk lorry loads for extra savings
.
All prices are
plus carriage, although the 50 litre bags are available ex-works.
The weight varies due to the variation in moisture content.
Geotextile
Membrane
This vapour permeable, geotextile membrane can
be used for gardening or landscaping purposes. We supply it for
use in a build up for a limecrete floor. It comes in a 4.5m roll
so we cut it down into linear metre lengths as required for ease
of carriage.
|
Width
|
PRICE
per linear metre
|
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4.5m
|
£2.50
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Back
to the Index
Guidance
on Thermal Values
The insulating clay aggregate
has a K-value thermal performance of 0.1W/m2k. The greatest insulation
is provided by the looselay beneath the limecrete slab as mixing
with a binder reduces the thermal performance.
The clay mixed with NHL5 is currently not certificated but a mix
with cement has been and offers a k-value of approximately 0.2 W/m2k.
The figures from this might reasonably be extrapolated and used
as an assumption of thermal performance when mixed with NHL5.
The 2006 revision
of Part L Building Regulations specifically allows a get out from
the regulations if those regulations are contrary to the well being
of a traditionally built property. For example, a damp proof membrane
or excessive depth of insulation required to meet Part L undermining
the shallow foundations.
Example of difference
that oversite and substrate make
| Area
of oversite (m²) |
Depth of coated clay insulation loose fill required (mm) |
| |
Clay
|
Sand
or Gravel |
Homogeneous
Rock |
| 0
- 50 |
200 |
210 |
210 |
| 50
- 100 |
180 |
200 |
210 |
| 100
- 150 |
150 |
190 |
210 |
Using the K-values
as above, here are some examples of u-values that may be achieved
using different depths;
100mm of limecrete
slab with 200mm of loose lay = 0.39
100mm of limecrete slab with 300mm of loose lay = 0.28
100mm of limecrete slab with 400mm of loose lay = 0.22
Guidelines
It is important to match the design of the limecrete to the
needs of the building. Factors include the type of construction
for both floor and walls, floor area and groundwater levels.
The thickness
of each component depends on a number of factors on which we can
advise. Some installers use NHL 3.5 which is moderately hydraulic
compared to NHL 5 which is termed eminently hydraulic. NHL 3.5 based
limecrete may take much longer to cure than NHL 5 and this will
be an important consideration in winter working.
Example Specification
1.
Levelled and compacted ground
2. Layer
of geotextile membrane
3. Loosefill.
A 220mm layer of loose fill 10-20mm coated clay insulation
4. Layer
of geotextile
membrane
5. Limecrete slab 3 parts clay aggregate1 part NHL5 by volume
6. Optional
75mm screed of 2 parts aggregate 1 part NHL5 to bed heating pipes
7. Bedding screed 20-50mm of 2 parts aggregate to 1 part
NHL5 to bed choice of breathable flagstone, tile etc.
8. Grout with 2 parts aggregate to 1 part NHL of choice for
colour
NB. 11-13 x
25kg bags NHL5 to 1m3 leca will cover 100m2 at 10mm depth
For some applications
a galvanised reinforcing mesh will be required on top of the coated
looselay insulation.
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