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How To Cut Metal Roofing



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hi guys Doug Schmidt with equity

builders coming to you again with more

tips and tricks today we're going to

talk about metal riffing we've got a big

house behind us with a big beautiful red

metal roof we got a lot of

do-it-yourselfers that are asking all

the time can can I do this myself it

looks really easy looking at some

YouTube videos and and you think you can

do it indeed you can there's not a lot

of difficulty about putting on a metal

roof as long as you understand the ABCs

of what you're doing let me describe a

little bit today obviously when you're

dealing with metal it's very easy to cut

yourself lots of sharp edges on the

metal so you definitely need a pair of

gloves that are not just impact

resistant but are going to keep you from

cutting your hands here wearing

something like this is definitely a must

when you're working with metal I'm going

to do this with just my normal glasses

on obviously you're going to want some

goggles as well safety goggles are

always always why is when you're working

with any type of construction one of the

big things you're going to need on

cutting metal is a good pair of shears

that's made for metal they work just

like scissors although you can tape take

a heavy heavy gauge metal like that 29

gauge 26 gauge whatever you're working

with and it'll it'll cut right through

it just like you'll your scissors will

cut with paper they also make a an

attachment for a cordless drill that's

really handy that will do your snipping

for you just by pulling the trigger you

can cut your round circles and stuff

you get into some difficulties with the

metal riffing because of the contour the

ribs that they have make it difficult

for things to get sealed up properly

which is the the hardest part about to

do it yourselfer trying to work with it

so on a regular single drift you would

have a pipe jack like this a boot for

various size pipes and you'll notice if

you're doing metal there's just there's

no way to get that that boot to seal

around the metal in order to accommodate

that on a on a metal roof they make a

boot like this you can cut it for

various size holes for different size

pipes and then it's it's very flexible

here so

wherever your pipe falls in the in the

field of your metal roofing we can we

can put that in we can shape it around

the contour of of the ribs and then put

put a screw about every inch all the way

around this and that will that will

squeeze that rubber boot down right

around these ribs and keep it from

leaking so slick little tools like that

that you'll need to learn a little bit

about if you're gonna try to do this

yourself I would always recommend of

course having a professional do this for

you because nobody needs a leak on the

roof and you really need to know what

you're doing

we're gonna hop up on the roof here and

show you some of the you can see the bar

across here which is a made for keeping

your snow and ice from running down and

ripping off your gutters I'll show you

what the boots look like on a real metal

roof up there and you can you can see

how they fit around the ribs okay so

we're here on the metal roof I want to

demonstrate the the fasteners used to

hold the metal roofing down it's not

just a normal screw the these screws if

you if you'll notice closely have its

own little washer on it and right below

the metal washer is another little

neoprene washer which is made to do the

to seal it watertight so as you tighten

that screw down the neoprene washer goes

down to your metal has a metal washer

right behind it you collapse that

neoprene washer just a little bit and

that'll that'll give you your watertight

seal now the problem with these

sometimes those screws through time are

going to work their way loose if that

loosens up then the neoprene washer

comes up and allow is going to allow

water to get down in the hole where the

screw is I'll show you some examples

this roofs been on for a few years if

you'll notice that how high the head of

this screw is through the years that's

loosened up and and we've gotten the you

know there there's nothing sealing water

on that anymore

it's a very simple fix you can you can

take your driver again tighten her back

down as long as there's still plywood to

hold it squeeze that neoprene washer

tight again and it'll be good to go

otherwise you can pull them back out and

just simply replace the replace the

screws so I showed you down by the truck

how they make the the boots to fit

around the pipe now which

so fits the contours of the metal

roofing so depending on on where the rib

lies in relation to your pipe you need

to put a boot on there with lots of

screws all the way around it so it

conforms around the the contours of your

metal this one through the years

apparently it had a leak so somebody has

come and really cocked all the way

around it ordinarily you don't need to

do the caulking those boots themselves

will fit tightly enough around the metal

to keep it sealed up and keep it leak

free then you've got a nice rubber

rubber flynn's that'll fit tightly

around your pipe and keep water out they

make them in various sizes they also

make great big huge ones for things like

like your solar tubes obviously it's

it's the same kind of thing just an

adjustable flange that'll that'll fit

around those contours so let's talk

about the metals themselves back 100

years ago there were a lot of everybody

always talked about tin roofs today

they're predominantly steel they've got

all kinds of painted steel normally a 29

gauge metal a lot of if you want

something a little heavier they'll go 26

gauge and they even make some stronger

stuff this is a very standard ribbed

design for most residential purposes on

commercial buildings they'll have a

different contour and have a standing

seam this particular one is called an

exposed fastener where you actually see

all of the fasteners exposed on the roof

they make one with hidden fasteners in

the in the ribs where you never see you

don't see all these screws they're

actually hidden and in the installation

process so some of the various parts are

pretty obvious

after getting the field on we need a

ridge cap to keep the ridge itself from

leaking we've got trims on the rakes

when you get to the outside the last

piece of metal on the edge of the roof

will have an l-shaped rake trim here

which goes over the edge and and gives a

nice finished trim right on to the edge

down at the bottom you'll notice the

snow guards the one big problem that

people have with metal roofs when if you

get three or four inches of snow on a

roof like this that's not very steep the

snow will sit on the roof and then all

of a sudden one day

you'll slam a door or something will

happen and cause it to start sliding and

once that snow begins to slide this

entire run will just rush right off of

you're off your roof in the process a

lot of times it'll tend to rip the

gutters off but if somebody is walking

or standing down there you'll have an

avalanche of snow to bury if so the

little snow guards here are very handy

to put on a foot or so above the gutters

to keep keep that avalanche of snow from

happening all right so one thing you

need to be careful of if you're gonna be

doing your own metal roofing this this

particular one is a 29 gauge metal with

the painted surface on it and whatever

color you choose you need to realize

that although your circular saw will cut

through this metal roof you can put a

metal blade on there and cut it with

that the problem is the speed of your

blade gets too fast it'll create too

much heat on this metal to where the

paint itself is going to it's going to

be damaged to annual in through a couple

of more years you'll end up with a lot

of rust on your metal roof that you

don't want so in order to eliminate the

the heat getting to great always use

some snips it's a little bit slower but

given the size of the scope of your

project it's not going to add that much

time to it you use your snips to cut off

your metal roofing it'll it'll cut it

very easily you can cut round circles

for your pipes or anything that you need

to your your vents or anything that you

need to cut around don't do it like I am

always make sure you wear your gloves

it's very easy to cut yourself on the

metal roofing if you don't have some

protective gloves on but you don't want

to use the the high speed of a skill saw

or any type of circular saw or because

it'll create too much heat and and

although it'll look fine the day you're

done a year or two later you're going to

end up with some rust built up there

I'll demonstrate a couple of days we're

going to be repairing one that has that

rest problem okay so the the snips make

it very easy cutting or cutting around

these ribs sometimes a little more

is a little more difficult but you'll

you'll notice they'll they'll make the

contour you can cut yep having all kinds

of trouble myself kind of doing straight

if if you need to cut circles around

taking a little bit of time nip nip

nipping at it as you go you can cut up

and over the ribs as well and then you

can take the time to clean up all the

little shards sharp edges okay and then

your boot or whatever your whatever

you're needing on there has its own

little seal that will fit around the

contours and seal up over that plenty of

screws around the perimeter will keep it

all tight and leak free okay so we were

talking the other day about cutting

metal roofing and we talked about the

importance of doing it with slow speed

if you use a skill saw or any any fairly

rapid blade motion like that it'll

create too much heat on the metal and

cause the paint to start rust and very

very prematurely here's a good example

that we're able to show now this metal

was cut with a skill saw and you can see

the bottom inch or so is all starting to

rust now this has been fifteen years ago

probably that that was cut it looks fine

when you're installing the roof using

the skill saw you don't notice any

problem because when you install it the

paint still looks good but because of

the overheating that happened at the

time this was cut you can see it up here

as well for the first three quarters of

an inch or so inch and a half down here

it we're it's just getting rusty and

working its way up the up the metal so

in order to prevent that problem make

sure you use slow speed cutters you can

either do it with hand snips or as we

demonstrate it before you can put some

snips on a cordless drill and they they

get the job done very very quickly for

you but without the high speed of a

circular saw