Hi guys, Just a quick question I come across the other day, its from the certifying plumber exam from November 2011, question one of the multiple choice section

1. What is the maximum diameter for a roof penetration that is permitted to be sealed with an EDPM rubber boot flashing before a soaker flashing is required??

The possible answers are as follows...

A. 50mm
B. 60mm
C. 75mm
D. 90mm
E. 110mm

I had just been reading E2 External Moisture  which covers pipe penetrations and flashings. My copy of E2 also includes all the latest amendments. It says that  EDPM rubber boot flashings are"Suitable for pipes UP TO 85mm diameter'' (page 87)  before a soaker flashing is required so I answered C. 75mm as 90mm is techically wrong as it is 5mm to big to use a EDPM rubber boot.

To my amazement I was wrong and the answer was B. 60mm...Can anyone assist me is seeing where I went wrong and what standard or code I should have referenced or is the model answer wrong? Is it in AS/NZS 3500 somewhere and I missed it??

Comments would be appreciated. Questions are hard enough as it is some of them, I need to know what I am learning is correct.

Cheers


Linkback: https://www.plumbers.nz/plumbing-gas-fitting-and-drainlaying-apprentice-support/3/certifying-plumber-question-nov-2011-regarding-edpm-rubber-boot-flashings/1128/

E2 page 80 8.4.17
Roof penetrations shall be flashed as follows:
a) Pipe penetrations up to 60 mm shall be
flashed using an EPDM boot flashing as
shown in Figure 53,
b) Pipe penetrations up to 500 mm shall be
flashed using a soaker flashing and EPDM
boot flashing as shown in Figure 54,

Rodza, it`s a sad day when you do not learn something new,cheers

I don't know the answer and I feel the question is quiet tough. I never seen such type of questions asked in any of the plumbing exams.