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HAP-Rakennus OY

Bitumen roof installation

We install a bitumen membrane covering on the roof of a new building: base layer, cap sheet, falls, upstands, penetrations and roof drains. The roof is built as one system, in which every junction is part of the same drainage.

When this is needed

On a new building the roof is usually ordered once the frame is up and the structure is ready to receive the covering. The earlier the roof is part of the design, the less has to be adapted afterwards.

  • The roof structure is complete and the covering is the next stage in the schedule.
  • The building has many penetrations, plant rooms or drains that must be fitted together.
  • Equipment or walkways will be added to the roof later and have to be allowed for in the covering now.

What the work includes

  1. 01Checking the substrate and forming the falls, so that water reaches the drains instead of ponding.
  2. 02Laying the SBS-modified base and cap sheets, with their laps and seams.
  3. 03Upstands at walls, parapets and plinths, including fixing and sealing their upper edge.
  4. 04Sealing penetrations, roof drains and vent pipes into the covering itself.
  5. 05Documenting the work: what was installed, where, and with which material.

Designing the roof structure and its load capacity belongs to the project's structural engineer. We are responsible for the covering and its junctions.

A worker heating a bitumen membrane seam with a torch, the flame visible.

How it runs

How a project runs.

  1. We look at the site
  2. We agree the work
  3. We prepare
  4. We do the work
  5. We finish and hand over

Quality of work

What decides the roof shows up close.

Good roofing work stands inspection from a few centimetres away.

  • A finished upstand at a rooflight, the membrane carried up the vertical face.

    Upstand

  • The junction between a brick chimney and the roof, closed with new flashing.

    Connection

  • A sealed roof penetration in the bitumen membrane, close up.

    Penetration

  • A worker bonding the membrane around a roof drain's flange with a gas torch.

    Roof drain

Contact

Tell us about the building and we will work out what fits.

We walk the site before quoting, so the scope is clear on both sides.

Contact