Design Guidance

Insulation Attachment

Icopal Thermazone PIR insulation boards should be attached at the minimum rate of 11 tubes & fasteners per 1.2 m x 2.4 m board (unless otherwise specified and approved). An increased density may be recommended depending on project location, height and exposure etc.

Membrane Attachment

For every mechanically fastened roof, a wind uplift calculation and fastener specification will be required prior to installation of the Icopal roof waterproofing membrane. All calculations are conducted in accordance with BS 6399 or BS EN 1991 parts 1-4, as appropriate.

Fastener Application

No pre-drilling is necessary for timber and steel decks.
Simply insert the fastener through the tubular washer and install with a standard clutch drive electric screw gun (0 – 2500 rpm). Optimum fastener performance is achieved when fastener is installed perpendicular to the deck and into the top flutes of a steel deck.

The TX-25 recess provides excellent drivability and the drill-point design cuts a hole in the steel deck maintaining contact between the deck and the minor diameter of the fastener, increasing back-out resistance.

Quality Assurance

Icopal Tubular Washers, Pressure Plates and Screw Fasteners are supplied under a Quality Management System approved to ISO 9001: 2004 by Swiss Association for Quality and Management Systems.

Technical Services

Specialist advice and design guidance on all matters relating to Icopal Tubular Washers, Pressure Plates and Screw Fasteners is freely available from our Technical Department

Guidance Notes (examples only)

To optimize the benefits of the Icopal Tubular Washer system, ideally use the maximum length of tube washer and the minimum fastener length available.

In certain applications, such as over-roofing of existing membrane and insulation layers, different tube lengths may be required.

The tube washer should be chosen first; then the fastener can be selected.

Guidance Notes (examples only)

When selecting the correct Icopal Screw Fastener length, allow for the recommended minimum deck penetration or embedment and take into consideration the total build-up of the roof system, including any pressure plate, membrane, separation layers insulation, vapour barriers, existing systems and structural deck.

To select the optimum fastener length (F) for tube washer applications: i) take the total roof system build-up measurement (A) and deduct the selected tube length (C). ii) allow for deck penetration (D) and then add minimum 20 mm allowance for the fastener within the tube (E) . iii) select the fastener at this length or longer.
eg, For a 140 mm build-up over 0.7mm steel deck using a 105mm tube the minimum fastener length would be 70 mm.
Total roof system build-up (A)	140mm
Deduct selected tube length (C)	-105mm
Add min. deck penetration/embedment (D)	+15mm
Add allowance for fastener within tube (E)	+20mm
Minimum fastener length (F)	70mm		Key: A: Total roof build-up depth B: Insulation compression tolerance (min 15mm) C: Tube Washer length D: minimum deck penetration or embedment E: min 20mm allowance for fastener in tube F: Fastener length

Guidance Notes (examples only)

The following table is provided as a quick reference guide for calculating the required tube washer and fastener combination for a new warm roof direct to a metal deck.

The thickness of structural deck used for the combination is indicated in the table below. The fastener length should be altered accordingly where the structural deck thickness or system build-up is different.

Metal Deck Application

Structural Deck:	0.7mm steel
Minimum Deck Penetration:	20 mm though underside
Suitable Fasteners:	Icopal BS-4.8mm Carbon Steel Fastener
	Icopal BS-S-4.8mm Stainless Steel Fastener
Tube Washer Type:	Icopal R45 Membrane Tube Washer
	Icopal R75 Insulation Tube Washer

Guidance Notes (examples only)

The following table is provided as a quick reference guide for calculating the required tube washer and fastener combination for a new warm roof direct to a plywood deck.

The thickness of structural deck used for the combination is indicated in the table below. The fastener length should be altered accordingly where the structural deck thickness or system build-up is different.

Plywood Deck Application

Structural Deck:	18mm plywood
Minimum deck penetration:	12mm though underside
Suitable Fasteners:	Icopal BS-4.8mm Carbon Steel Fastener
	Icopal BS-S-4.8mm Stainless Steel Fastener
Tube Washer Type:	Icopal R45 Membrane Tube Washer
	Icopal R75 Insulation Tube Washer

Guidance Notes (examples only)

The following table is provided as a quick reference guide for calculating the required tube washer and fastener combination for a new warm roof direct to a concretel deck.

The thickness of structural deck used for the combination is indicated in the table below. The fastener length should be altered accordingly where the structural deck thickness or system build-up is different.

Concrete Deck Application

Structural Deck:	Concrete †
Minimum deck embedment:	20 mm though underside
Suitable Fasteners:	Icopal TI-T25 6.3 mm Carbon Steel Fastener
	- Pilot hole diameter to be determined by a pull out test.
	- Drill depth to be 10 – 25 mm greater than fastener embedment, to allow for swarf.
Tube Washer Type:	Icopal R45 Membrane Tube Washer
	Icopal R75 Insulation Tube Washer

† Note: Fastener length & Tube Washer combination has been calculated based on fixing direct to concrete slab without screed.