Lead Flashing

[andy24]

I am goinf to be putting my conservatory up in a couple of weeks and am after some advice on how best to do the flashing. It will be a georgian style. The ones I have seen have been stepped leading - look gr8 when done but difficult to do. Can anyone offer any pointers as to the best wasy to tackle this?

 

[masona]

Difference ways of doing it,have a practise with a paper template so you don't waste the lead materials

 

[andy24]

would be similar to the "lead flashing over plain tiles" I think. Just a little unsure of how is best to start measuring up for grinding the holes out into the house to feed the lead into???????

 

[masona]

Just a little unsure of how is best to start measuring up for grinding the holes out into the house to feed the lead into???????

Approx 200-250mm from the edge of the sloping roof outward.Doesn't matter if you go further as you have to re-point it anyway.
I admire you for having a go but it's not easy,if you come unstruck you can always have it done.

 

[renovator]

I believe that you also need to use lead wedges to hold the flashing into the abutment before pointing.
Also you would be wise to make a wooden form to shape the flashing as it turns from the abutment onto the roof. This will allow you to achieve an consistent finish down the flashing

 

[andy24]

if someone could just rest my mind by confirming the following that would be great:
the horizontal parts go into the brickwork by approx 25mm - the vertical parts do not enter the brickwork.

I am sure of this but would just like to check - a doubt in my mind - what stops the water running in this way????

 

[masona]

what stops the water running in this way????

I knew you'll be back

Yes you're right,some roofer put tar behind it,but I use this which is suitable for lead flashing.

 

[andy24]

is it best to do this in small sections - i.e. one bit per step or try to one long continous length??

I have no probs with the conservatory or roof - just this flashing!!

 

[masona]

As it's your first time,I would cut the lead at approx 500-600mm lenght and make sure you have a minimum 150mm overlap to stop the rain blowing back upward.

I will say it's not easy as you have to handle with care not to mark/dent it as it will be noticeable.

 

[andy24]

how is the best way to mark it - lay it along where it's going and do it that way??? want it to look neat. problem is I'm fitting it nxt w/end - the only time I can get someone to give me a hand - will be really difficult to get someone else to do it as I'm not exactly sure when we will be up to that part. I was considering making a template up - perhaps froms some wallpaper or a border - do you think this would help?

 

[masona]

I was considering making a template up - perhaps froms some wallpaper or a border - do you think this would help?

Yes and work on the workbench,table or plywood etc.Cut out the step first then a piece of timber,say approx 4"x1" lay flat toward the centre of the lead then move that to the edge of the table (you might find it easier to use G-cramp to the table) and bend it upright with another 4"x1" underneath to form a L-shape.Never hit the lead with a hammer,use a block of wood to protect it or better still use a proper lead tools accessories.

 

[andy24]

job done!!! as it happened when I unpacked the roof there was something called conservaflash in it - a plastic modular flasing - specifically designed by the manufacture of the roof - ultraframe. What a doddle - grind out the slots - pop it in and seal up!!! what was I worrying about!

 

[masona]

For those who don't know what conservaflash is.

Well done,what did they recommend for the side step to stop the rain going in ?

 

[andy24]

side step........do you mean where it goes into the wall?? if so you only need to grind out a really thin slot - and judging by the pictures I got with it - silicone sealant sufficed!!