Question 1

Please advise suitable flanking strip to specify with 28mm Cellecta ScreedBoard.

Accepted Answer

This depends on the floor finish you are looking at and whether you intend to install the ScreedBoard prior to drylining. It is important that all aspects of the wall treatment are isolated from the floor. For ease of installation, Cellecta manufacture various flanking strip sizes. Should you only need to isolate the skirting board then FS30 is the most suitable. Should you need to isolate the plasterboard and skirting then FS50 will be more suitable. Finally for areas where vinyl is being installed the specially designed FS15 can be utilised.

Question 2

Installing ScreedBoard 20, can you tile straight to it?

Accepted Answer

The ScreedBoard 20 as an exceptional level of tolerance and therefore can take a multitude of floor finishes. You will need to prime and seal the board with Cellecta MP60 Primer before installing the tile adhesive.
Once dried, you can then bond tiles directly to the ScreedBoard. For any natural stone tiles, your installer may require a de-coupling layer to aid with natural movement in the tile.

Question 3

I require a very thin system to achieve Underfloor Heating

Accepted Answer

I require a very thin system to achieve underfloor heating over the top of an existing screed floor that will allow me to lay timber flooring and tiles over the top.
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Cellecta’s XFLO Micro TB utilises our ultra-strength, 500kPa insulation routed to suit your underfloor heating pipe. The board also has tile membrane to ensure an exceptional bond for tiles or wooden flooring. Starting at 15mm the board offers a very minimal increase in the overall floor height whilst having very good resistance to downward heat loss.

Question 4

Grade II* Listed building. I need to retain the floorboards.

Accepted Answer

DECKfon ULTRAmat 15 is a high density composite mat, that improves both airborne and impact performance of a floor where it is not possible to upgrade the ceiling. This is a floating layer that does not need to be fixed to the timber floors therefore negating the risk of damaging your existing floorboards.

Question 5

With a new build house, could you tell me if it is acceptable to put chipboard or OCB sheet?

Accepted Answer

New build house - Could you tell me if it is acceptable to put chipboard or OCB sheet flooring directly onto the insulation blocks instead of a screed?
Due to the natural expansion of chipboards we recommend that the insulation and chipboard are bonded. If installed in separate layers, the movement of the chipboard can create squeaking. We would always advise the use of HEXATHERM XCHiP, manufactured utilising our outstanding XPS insulation bonded to chipboard, which will alleviate the risk of friction noise.

Question 6

We need to specify an acoustic underlay between the screed and the concrete plank

Accepted Answer

We would like to know whether the YELOfon HD10+ would require any overlaps when jointing two YELOfon sheets or just the J-strip to be used there?
If overlaying with an underfloor heating system or using a 40mm anhydrite screed, it is acceptable to butt joint the YELOfon HD10+ before taping this joint with YELOfon J-Strip. Care must be taken to not leave any gaps that screed can migrate through and it is good practice to install a 500 gauge DPM in this instance. In all other applications you will need to overlap the YELOfon HD10+ by 150mm following the markings on conveniently printed on the rolls for ease of installation.

Question 7

Where does Cellecta manufacture its products?

Accepted Answer

Cellecta is one of the UK’s largest producers of environmentally friendly, high performance thermal, acoustic, and underfloor heating products manufactured in Rochester, Kent.

Question 8

Where can I purchase Cellecta products?

Accepted Answer

Cellecta products can be purchased through most leading UK insulation distributors and builder’s merchants. Our dedicated sales team would be happy to supply you with your nearest stockist.

Question 9

Where should I install ScreedBoard 20?

Accepted Answer

Our Trademarked product, ScreedBoard 20 is typically specified over an underfloor heating application due to its low resistance, ultimately giving a more responsive and cost-effective underfloor heating solution that means you can have low flow temperatures in line with Future Homes Standards.

Question 10

What is the difference between ScreedBoard 28 and 30?

Accepted Answer

ScreedBoard 28 comprises our high-density gypsum overlay board and an 8mm FIBREfon fleece, making it an ideal solution for lightweight floors such as timber or metal joists. ScreedBoard 30 utilises a 10mm wood fibre, that is a higher compressive strength resilient layer for concrete floors.

Both products can be utilised in concrete Robust Detail applications under FFT4, whilst ScreedBoard 28 holds three proprietary RD’s – E-FS-3, E-FT-5, & E-FT-6.

Question 11

What weight saving does ScreedBoard provide over screed?

Accepted Answer

ScreedBoard 20 would provide a weight saving off 125kg per m2 compared to a 75mm sand and cement screeded application.

Question 12

Cutting ScreedBoard "V" cement particle board - pro's and cons - and tools required

Accepted Answer

ScreedBoard is 99% gypsum and as such contains no cement. The board can be cut with a circular or hand saw in well-ventilated areas. If using a circular saw, suitable dust extraction units and face mask should be used, please consult Cellecta’s SDS on our website.
Cement particle board when cut, produces a fine dust that contains silica, which is hazardous to the lungs. You may also need specialist blades for cutting such as diamond tipped.

Question 13

What is the most suitable flanking strip to specify with ScreedBoard 20, 28 and 30

Accepted Answer

YELOfon Flanking strips (FS) are required to isolate the ScreedBoard from the walls, drylining and any skirting. Manufactured in three profiles 15mm, 30mm and 50mm to suit varying scenarios and floor finishes.

These profiled strips will help with easy and robust installation. To ensure you have the correct Flanking Strip for your requirements, please contact our technical team.

Question 14

Can ScreedBoard be installed over joist?

Accepted Answer

ScreedBoard shouldn’t be installed direct to joists as a non-structural board, however, Cellecta do have a portfolio of direct to joist products for acoustics and underfloor heating. Please contact our expert team for an alternative specification and to review your options.

Question 15

When should I consider installing a movement joint in ScreedBoard?

Accepted Answer

It is always good practice to replicate movement joints in the fabric of the building through the acoustic treatment. Although ScreedBoard has an exceptionally low thermal expansion, it is also best practice to have expansion for runs exceeding 20m.

Question 16

Do I need to prime HiDECK before tiling on top?

Accepted Answer

Some tiles may need an extremely low level of deflection, making HiDECK Structural an excellent product for accepting brittle floor finishes.
Prime and seal the HiDECK flooring using Cellecta MP60 primer. Once dried, you can then bond tiles directly to the HiDECK. For any natural stone tiles, your installer may require a de-coupling layer to aid with natural movement in the tile. For high load areas, it is advisable to bring the centres of the supporting timber closer under the HiDECK.

Question 17

Can electrical UFH be installed on top of HiDECK?

Accepted Answer

Yes, electric UFH can be installed directly onto the surface of a primed HiDECK and ScreedBoard.

Question 18

What is the max span HiDECK can be installed at?

Accepted Answer

Timbers should be installed at a maximum of 400mm centres beneath the HiDECK Structural.

Question 19

Does Cellecta Pro adhesive become effected from the heat when using HiDECK as an overlay board?

Accepted Answer

The temperature of the board at the glue line will not affect the Cellecta Pro adhesive once cured.

Question 20

Does YELOfon HD10 come with a Robust Detail?

Accepted Answer

YELOfon HD10+ Surebond System carries 3 proprietary Robust Details: E-FC-5, 17 & 18.

Question 21

Does YELOfon HD10+ require any overlaps when jointing two YELOfon sheets or can the J-strip be used?

Accepted Answer

Where two joints of the HD10+ meet, overlap the resilient layer by 150mm (min) and seal with J-Strip to alleviate the risk of screed migration. For anhydrite screeds that are thinner in nature butt-jointing the HD10+ is acceptable, however, this should then be overlaid with a polythene sheet.

Question 22

Can UFH be used in conjunction with YELOfon HD10?

Accepted Answer

Yes, either install an insulation over the top, such as HEXATHERM XFLOOR to achieve the resistance required by building regulations or install a castellated tray to clip the pipes in to.

Question 23

What is the minimum temperature HD10 can be installed at?

Accepted Answer

HD10+ should be installed at temperatures above 5°c. This is to aid with the adhesion of the J-Strip.

Question 24

What is the U-Value?

Accepted Answer

Thermal transmittance, also known as U-value, is the rate of transfer of heat through a structure (which can be a single material or a composite), divided by the difference in temperature across that structure. The units of measurement are W/m²K. Cellecta’s experienced technical team can quickly and easily run a U-value calculation for you.

Question 25

Are Cellecta products ISO 9001 certified?

Accepted Answer

Cellecta products are manufactured under ISO 9001 quality management system standard.

Question 26

Are Cellecta products ISO 14001 certified?

Accepted Answer

Cellecta products are manufactured under ISO 14001 environmental management system standard.

Question 27

What is the recycled content of ScreedBoard 20?

Accepted Answer

ScreedBoard 20 is manufactured using 100% recycled high density gypsum.

Question 28

Can XPS be recycled?

Accepted Answer

Yes, XPS can be recycled by melting and re-inserting it into the production of new extruded polystyrene foam insulation.

Question 29

What first floor Underfloor Heating solutions does Cellecta have for housing?

Accepted Answer

Cellecta manufactures several solutions that can meet Part L of building regulations, our low-profile solutions are designed to offer flexibility in thickness, performance, and design. Get in touch with our technical team to discuss your requirements.

Question 30

What is the maximum height for a raised levelling floor system?

Accepted Answer

Cellecta can offer an acoustic cradle and batten to suit almost every situation. Generally, the maximum thickness will be 269mm, however, elements such as underfloor heating, batten centres and how uneven the floor is will all play a part in the specification. Cellecta’s technical team can ensure you are using the correct build-up for your onsite requirements.

Question 31

What primer should I use for XFLO Tiling Board?

Accepted Answer

XFLO Tiling Board, has a reinforced face that can accept a tile directly without additional primers, however, the board is also compatible with most gritted primers such as the F. Ball P141 and Tilemasters Prime+ Grip.

Question 32

Does CHiPFLO require an overlay board?

Accepted Answer

Yes, CHiPFLO requires an additional overlay board. At 400mm joist centres this is typically a 6mm plywood or for superior outputs, Cellecta CEMdeck. For joist centres greater then 400mm and up to 600mm this overlay board should be 9mm.

Question 33

What is the best concrete to overlay insuBEAM?

Accepted Answer

insuBEAM requires a C28/35 structural concrete over the top, the minimum thickness and reinforcement required all depends on the usage of the floor. Please contact our insuBEAM department for full specifications. 
Tarmac Topflow has also been tested and is covered under Cellecta’s third party accreditation.

Question 34

How can I achieve a low u-value with insuBEAM?

Accepted Answer

U-values for ground floors rely on the perimeter and area of the ground floor. insuBEAM is designed to achieve low U-values in line with Part L of building regulations and can achieve as low as 0.08w/m2K. 
Please contact our insuBEAM team who will run a U-value calculation and provide a system specific for your requirements.

Question 35

How do I incorporate UFH on insuBEAM?

Accepted Answer

Underfloor heating pipes can easily be integrated into the floor prior to applying the structural concrete finish.

Question 36

Does Cellecta provide a take of services for insuBEAM?

Accepted Answer

Cellecta’s experienced technicians can produce a beam layout to suit the foundation plan & the U-value achieved and will also undertake a full take off service for each individual plot/project. 
Furthermore, when the material is supplied to site, each plot will be palletised with the relevant insulation components required.

Question 37

What is the correct edging strip to be installed with RUBBERfon Impact?

Accepted Answer

RUBBERfon edge (5mm x 200mm x 50m) would be used for perimeter edge strip. RUBBERfon Impact 3 doesn’t require an edge strip as it can be turned up at the perimeter to isolate any screed.

Question 38

Does RUBBERfon Impact come with a Robust Detail?

Accepted Answer

Yes, RUBBERfon comes with two Robust Detail treatment E-FC-18 & E-FC-19.

Question 39

Can I tile direct to RUBBERfon ULTRAtop?

Accepted Answer

Yes, once bonded to the floor ULTRAtop can directly accept a tile. Please refer to tile adhesive manufacturers recommendations.

Question 40

What insulation should I specify for my swimming pool?

Accepted Answer

Cellecta XPOOL insulation boards have an ultra-high resistance to compression and outstanding thermal performance, providing long term energy savings. Cellecta’s technical team can also run a swimming pool U-value calculation to determine the thickness of XPOOL required to meet Building Regulations.

Frequently Asked Questions

Listed below are answers to some of the questions we are asked regularly.