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.
Internal gutter design.
A continuous lock strip is soldered to the apron at least 4 below its upper edge.
Metallic coated steel is not recommended for internal gutters that are difficult to replace.
Iko armourplan 0 6mm and1 2mm and sika trocal 0 8 and 1 2 mm application.
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.
0 67w m 2 k 30mm thick to 0 21w m 2 k 100mm thick membrane.
E2 as1 8 1 6 1 requires all internal gutters to have a minimum 1 100 slope.
To make internal gutters as safe and durable.
Available in lengths up to 8m fire rating.
2014 class b maximum 868mm boundary sole 700mm valley sole dimension.
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.
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.
Branz bulletin 556.
Boundary valley and valley hip lengths.
The design of gutter and downspout assemblies is an area of building design which demands special attention.
E2 as1 specifies no end laps for membrane lined internal gutters and that metal gutter laps are welded.
Can be purchased for 13 50 from www branz co nz or call 0800 80 80 85.
Leaking gutters and downspouts can cause serious damage to a building s interior as well as exterior and repairs can be expensive.
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.
Internal gutters also known as box gutters are seen as an easy solution to the collection and disposal of roof water.
This bulletin outlines the requirements of e1 as1 and e2 as1 and gives design parameters to minimise the risk.
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.
In this detail a one piece copper gutter lining and apron is used in conjunction with a standing seam roof.
Often the outlet to the valley gutter discharged over a small portion of roof before being contained by the eaves gutter figure 7.
Maintenance durability and longevity are important factors to consider when designing gutters and.
Ongoing maintenance of internal gutters is as essential as good design and.
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.
