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Parapet and internal gutters


Internal gutters are folded to shape either on site or in the workshop. The gutter sections are joined end to end with soft soldered joints. They should be laid to a fall if possible to promote self-cleaning and increase flow capacity.

Additional overflow protection

Buildings which require very high protection from water ingress may need a second gutter under the zinc gutter, to act as a back-up system. This secondary gutter must drain into an outlet into which the zinc outlet sits.

Thermal expansion

Thermal expansion and contraction is accommodated for by inserting ‘T’-Pren type expansion joints within the gutter run, and ensuring that the gutter is loosely clipped along its sides so it can more freely.

Snow and ice protection

In cold climates, thermostatically controlled trace heating cables should be installed in gutters where there is a risk of snow and ice build-up blocking the water flow. In addition, snow retention systems should be installed to prevent snow from the roof from sliding into the gutter and blocking it – local regulations may apply.

Flow capacity

Internal gutter capacity is also calculated using EN 12056-3. However, guidance on calculating the required capacity of the system is beyond the scope of this media. Please contact elZinc for assistance in this regard if required.

Key points

  • Long lasting and maintenance free
  • Lightweight and sustainable
  • Matches the elzinc® roof
  • Must be carefully designed and installed

Thermal expansion

Gutter girth (mm) Exp. Jt. centres (m) Max. distance from outlet, corners etc. (m)
≤500 <8 <4
>500 <15 <7,5

Basic information

1. Internal elZinc® gutter
2. Gutter clip (loose to let the gutter move)
3. ‘T-Pren’ expansion joint (soldered to gutter)
4. Conical outlet (soldered to gutter) leads to rwp
5. Insect mesh (if required) Perforated elZinc® sheet, 5mm dia. holes shown
6. Galvanised steel continuous retaining strip
7. elZinc ‘T’ plate (with back fold when roof pitched below 15º
8. Standing seam trays
9. Cladding below gutter
10. Underlay and membrane (if required – mat and breather shown)
11. Substrate (varies according to roof design and country)