Competitive prices. Excellent Service with prompt delivery. I would recommend IQ to others and will certainly use again.
Mr K
Excellent, professional, efficient service from IQ Builders Merchant. Needed to purchase 3000 bricks to finish a new build project, Oliver was great in sourcing the same bricks, at a very good price, had them delivered in a matter of a few days. Happy to use again and to recommend.
Mr G
Ordered the STUNNING XL Joinery PreFinished Walnut Portici Door . Very pleased with the service 10/10
Mrs W

Econocheck Underscreed XL5: Impact Improvement System 1.5x50M

The Econocheck Underscreed XL5 system is designed to be placed within a masonry structural floor directly below the screed.
Dispatched Via: Isomass
Delivery Time: Estimated 3-5 Days
Product Brand: Isomass
Price on application
  • Description
  • Delivery
  • Price Request

•  Conversions
•  New Build

The econocheck underscreed XL5 system is designed to be placed within a masonry structural floor directly below the screed. This isolates the screed from the structural sub floor, and provides sufficient impact absorbsion to place it amongst the top performing systems available.

The econocheck underscreed XL5 system from Isomass features a 5mm closed cell cross linked foam layer.

By ensuring that all the joints are taped, bridging will be eliminated which is the single greatest cause of failure of any system of this type.

When installed correctly, the econocheck underscreed XL5 system will enable compliance with Approved Document E 2003 and subsequent amendments in 2004, 2010 and 2013.


Closed cells prevents water absorbsion which can impair acoustic performance.

Rolls are light and easy to handle.

All installations over 500m2 come with a free site pre screed inspection.

Performance (on the construction illustrated)

Treated floor with:
DnT,w+ Ctr
Econocheck XL5

based upon the typical construction (commonly 50dB+).

Compliance with Code for Sustainable Homes is possible for econocheck XL5; please contact Isomass for design advice.

Product data

Roll dimensions: 1.5m wide x 50m
Thickness: 5mm
Foam composition: Closed Cell Cross Linked Isopoli


The acoustic floor shall be:

Econocheck underscreed XL5 system, manufactured by Isomass Ltd. Unit 11, Avenue Business Park, Elsworth, Cambridgeshire, CB23 4EY and installed in accordance with manufacturer’s instructions / recommendations.


The floor surface should be swept free of any loose debris that may damage or bridge the system.

Econocheck XL5 can be rolled up the wall or lapped and taped to a perimeter flanking strip. Either option should allow a minimum 50mm to protrude above the intended FFL of the screed (see right).

Adjoining roll edges should be butt-jointed jointed and sealed with a minimum 100mm wide jointing tape.

Services that penetrate the screed should be isolated by wrapping with Underscreed which again would be taped.

When trafficing the floor take care not to perform any unecessary actions that may cause any of the taped joints to be forced apart.

Full installation instructions for econocheck XL5 are available upon request. These must be used in conjunction with this booklet when laying the econocheck XL5 system.


To view a photograph mouse over the camera icon above

Shallow Batten
  • 80kg/m2 sand/cement screed or 65mm proprietary screed.
  • Optional (1000 gauge or 0.25mm) plastic sheeting - to aid screed pouring and maintain joints in econocheck underscreed XL5.
  • Econocheck underscreed XL5 on grouted sub floor.
  • ≥300kg/m2 minimum structural sub floor.
  • 75mm min. void formed by metal frame suspended ceiling system and ≥10kg/m2 gypsum board ceiling.

Here at IQ Builders Merchant we offer such a wide variety of products in all manner of shapes, sizes and weights. Each of our ranges has a particular delivery process to ensure the safe delivery of each item. Below we have listed a selection of our best selling ranges and the delivery time for these ranges;

  • Brick Reinforcement - 1-2 Days

  • Building Materials - 1-2 Days

  • Lintels - 10-20 Days

  • Deanta Doors - 3-5 Days

  • XL Joinery Doors - 5 Days

  • LPD Doors - 3-5 Days

  • Timber Windows - 4-5 Weeks

  • Drainage 2-3 Days

  • Velux Roof Windows 3-5 Days (please check before ordering as some are now on longer lead times)

All deliveries are subject to stock and we will be sure to give you as much notice as possible for any stock issues that may affect your delivery.

Any lead times quoted online or by a member of our staff, will be in working days (Mon-Fri).

Additional Delivery charges apply for the following postcodes: PA, DD, PH, KW, KV, AB, IV, HS 

A preferred delivery date can be entered when ordering, however this is not guaranteed. 

Deliveries are made between 7.00am – 5.30pm Monday - Friday although we will give you as much notice as possible for early/late deliveries.

Delivery will only be arranged to destinations within mainland UK. Please supply the full delivery address at the time of order this may differ from the billing address so long as the billing address matches the card holder’s address.

Delivery will occur when the Goods are ready for unloading at the delivery address specified at time of order or as subsequently agreed by both the buyer and IQ Builders Merchant.

Any dates specified by IQ Builders Merchant for delivery of the Goods are intended to be an estimate and time for delivery shall not be made of the essence by notice. If no dates are so specified, delivery shall be within a reasonable time.

Subject to the other provisions of these conditions, IQ Builders Merchant shall not be liable for any direct, indirect or consequential loss (all three of which terms include, without limitation, pure economic loss, loss of profits, loss of business, depletion of goodwill and similar loss), costs, damages, charges or expenses caused directly or indirectly by any delay in the delivery of the Goods.

IQ Builders Merchant shall arrange for delivery to site on the understanding that there is a suitable road to the delivery address requested. If no such road exists delivery will be made to the nearest point to which, in the opinion of the driver, the vehicle may safely proceed and unload. Except for the use of a vehicle mounted crane, the Buyer will provide all necessary labour and equipment required to unload the Goods promptly.

A signature on the delivery note constitutes that all materials have been received in good order.  It is the responsibility of the buyer to ensure that all goods have been checked and any damages noted to the delivery driver at the time of delivery.

Delivery of all Heavyside/Big & Bulky/Pallet items are made kerbside.

All deliveries of palletised products (Brick/Block/Paving/Specified at time of order) will be delivered using a pallet truck and if this is over 1T mechanical offload will be required on site. A Crane offload delivery service is available also at an extra cost.

Parcel deliveries will only be made once to the specified delivery address, any required re-delivery may be chargeable.

It is the responsibility of the buyer to be home/on site on the day of delivery agreed by both the buyer and IQ Builders Merchant.


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