Lead Box Gutter Fall

Failure to do this can result in ponding water which may find its way into the fabric of a building.

Lead box gutter fall.

The fall is sufficient for this to be possible a length of lead expansion joint may be welded between the upper and lower sheets. Allowable box gutter width slope and length required by the australian plumbing code as nzs 3500 3 2 box gutters allowable width slope and length to as nzs 3500 3 2018 stormwater drainage acceptable solutions. Apply the oil before any rain and at the end of the day s work. This is very important so that water will overflow externally to the building rather than flood into the roof cavity.

It may be lined with epdm rubber metal asphalt or roofing felt and may be concealed behind a parapet or the eaves or in a roof valley. Once the gutter is properly pitched re install the gutter brackets. Defects here often seep quietly for months or even years providing the ideal conditions for dry rot wet rot insect infestations and other forms of decay. Simple parapet gutter at corpus christi college lead linings are commonly found in the valleys between pitched roofs and behind masonry parapets.

The gutter should have a quarter inch of slope per 10 feet. Pull the gutter down about 3 quarters of an inch lower than it originally was. Put a temporary screw at the back to adjust the pitch. Line the gutter with moisture resistant 18mm t and g flooring and have it fibreglassed.

There will also be an overflow facility on the side or the end. Box gutters are essentially placed between parallel surfaces as in a valley between parallel roofs or at the junction of a roof and. Lift flashings and coat the underside of the lead for about 50mm from the edge. Coat the lead before turning up clips around the edges.

A good box gutter design will have falls along its length together with sumps to collect water before it is fed into large downpipes. All lead sheet must be laid on a minimum fall of 1 80 or just over 1 degree. Remember to coat between laps. Traditionally in applications such as lead lined gutters lead sheet lengths are joined by overlapping them at drips that stand at least 50mm high.

A weather tight joint is thus. Drop as low as 1 120 fall depending on the roof area and don t step it. One coat is all that is needed.