Internal Gutter Design

Internal gutter construction gutter construction varied from a simple shallow trough or v like a valley detail to a tapered valley laid over firred framing to give a fall figures 5 and 6.

Internal gutter design.

The design of gutter and downspout assemblies is an area of building design which demands special attention. E2 as1 8 1 6 1 requires all internal gutters to have a minimum 1 100 slope. Maintenance durability and longevity are important factors to consider when designing gutters and. Iko armourplan 0 6mm and1 2mm and sika trocal 0 8 and 1 2 mm application.

Lpcb certified to lps 1181 grade ext b non fragility performance. Checked annually for any damage or deterioration to the gutter lining cleared to remove debris leaves etc. Ongoing maintenance of internal gutters is as essential as good design and. Downpipe eaves gutter long straight eaves gutters box gutter to rain water head box gutter vertical faces box gutter side o flow box gutter vertical o flow storm water pipe size storm water network overland flow path spitter upstream end custom rain water head.

Branz bulletin 556. Can be purchased for 13 50 from www branz co nz or call 0800 80 80 85. 0 67w m 2 k 30mm thick to 0 21w m 2 k 100mm thick membrane. Often the outlet to the valley gutter discharged over a small portion of roof before being contained by the eaves gutter figure 7.

Design for a 10 minute rainfall intensity for the location with a recommended minimum design intensity of 200 mm hour rainfall intensity is for a storm with a 10 probability of occurring annually. Figure 2 membrane roof and gutter design. Learn more how to storm water design for building sites. 2014 class b maximum 868mm boundary sole 700mm valley sole dimension.

Internal gutters when internal gutters are difficult to replace and their failure could cause major disruption to the building below they must be made from materials that will last 50 years to comply with the nzbc. Metallic coated steel is not recommended for internal gutters that are difficult to replace. However significant inconvenience damage repair cost and health issues may occur if water from the gutter gets into the building structure and or the space below. This bulletin outlines the requirements of e1 as1 and e2 as1 and gives design parameters to minimise the risk.

The upper edge of the gutter apron extends at least 6 onto the roof and is folded over and held by cleats at 12 o c. Leaking gutters and downspouts can cause serious damage to a building s interior as well as exterior and repairs can be expensive. A continuous lock strip is soldered to the apron at least 4 below its upper edge. With the exception of membrane roofs water from internal gutters must discharge into a rainwater head or to an internal outlet as shown in e2 as1 figures 63 a and b and figures 64 b or c see figure 3.

Available in lengths up to 8m fire rating. E2 as1 specifies no end laps for membrane lined internal gutters and that metal gutter laps are welded. Boundary valley and valley hip lengths.