i've tried now a few times to get this to
stick to the concrete, but it doesn't. i've
even roughed up the surface a bit.

using mortar mix.

is there something i can add to the mix
that will help it stick? or should i use
something else?

i like the mortar mix because it is smooth
and sets up nice.

hope to do this again this week because
the car that is usually in and out of the
garage is gone and it can cure before getting
driven over again.


songbird

On 6/22/2017 8:39 AM, songbird wrote:
i've tried now a few times to get this to
stick to the concrete, but it doesn't. i've
even roughed up the surface a bit.

using mortar mix.

is there something i can add to the mix
that will help it stick? or should i use
something else?

i like the mortar mix because it is smooth
and sets up nice.

hope to do this again this week because
the car that is usually in and out of the
garage is gone and it can cure before getting
driven over again.


songbird

Try using some Titebond III in your mix , and coat the area with some
before you put the mix in place . Roughing it as you've done can help .
Also , "grinding" the mix into the surface can help .

Terry Coombs wrote:
....
Try using some Titebond III in your mix , and coat the area with some
before you put the mix in place . Roughing it as you've done can help .
Also , "grinding" the mix into the surface can help .

ok, tks, will give it a try. can't be any worse
than what is there now. hate the idea of having to
rip it all up again, but at least i have places i
can use the scraps as fill.


songbird

Terry Coombs wrote:
....
Try using some Titebond III in your mix , and coat the area with some
before you put the mix in place . Roughing it as you've done can help .
Also , "grinding" the mix into the surface can help .

will that give any flexibility? there is a
slight crack in the slab and i'm hoping to
have something a bit more flexible over it.

by slight i mean hairline...

i know there are rubber type additives but
i'm not sure they'd work for mortar mix.

in the end if this doesn't work the next
thing to do would be to get a grinder and
take the whole sill down to give it the right
slope. i'm not looking forwards to that
extreme tho...


songbird

On Thursday, June 22, 2017 at 9:39:54 AM UTC-4, songbird wrote:
i've tried now a few times to get this to
stick to the concrete, but it doesn't. i've
even roughed up the surface a bit.

using mortar mix.

is there something i can add to the mix
that will help it stick? or should i use
something else?

i like the mortar mix because it is smooth
and sets up nice.

hope to do this again this week because
the car that is usually in and out of the
garage is gone and it can cure before getting
driven over again.


songbird

My first thought would be to use epoxy.

On Thu, 22 Jun 2017 08:53:22 -0500, Terry Coombs
wrote:

On 6/22/2017 8:39 AM, songbird wrote:
i've tried now a few times to get this to
stick to the concrete, but it doesn't. i've
even roughed up the surface a bit.

using mortar mix.

is there something i can add to the mix
that will help it stick? or should i use
something else?

i like the mortar mix because it is smooth
and sets up nice.

hope to do this again this week because
the car that is usually in and out of the
garage is gone and it can cure before getting
driven over again.


songbird

Try using some Titebond III in your mix , and coat the area with some
before you put the mix in place . Roughing it as you've done can help .
Also , "grinding" the mix into the surface can help .
Etch the old concrete, dampen it and brush it with "bonding agent"
which is basically titebond, and mix "bonding agent (titebond) as part
of the water when you mix your concrete/mortar. I'd recommend using a
"grout" mix over mortar, myself.

posted for all of us...



On Thu, 22 Jun 2017 08:53:22 -0500, Terry Coombs
wrote:

On 6/22/2017 8:39 AM, songbird wrote:
i've tried now a few times to get this to
stick to the concrete, but it doesn't. i've
even roughed up the surface a bit.

using mortar mix.

is there something i can add to the mix
that will help it stick? or should i use
something else?

i like the mortar mix because it is smooth
and sets up nice.

hope to do this again this week because
the car that is usually in and out of the
garage is gone and it can cure before getting
driven over again.


songbird

Try using some Titebond III in your mix , and coat the area with some
before you put the mix in place . Roughing it as you've done can help .
Also , "grinding" the mix into the surface can help .
Etch the old concrete, dampen it and brush it with "bonding agent"
which is basically titebond, and mix "bonding agent (titebond) as part
of the water when you mix your concrete/mortar. I'd recommend using a
"grout" mix over mortar, myself.

IMHO this is the best solution.

--
Tekkie

songbird wrote:
....
is there something i can add to the mix
that will help it stick? or should i use
something else?

....

they didn't have Titebond III but another
bonding agent. so i chipped out the whole
sill this morning and then redid it with
fresh mortar with the acrylic bonding agent
added to it (about 2/3 bonding agent and
1/3 water) also used the bonding agent as
described on the container to coat the surface
before i put the mortar down (everything was
kept damp as described).

some of the previous rounds were sticking
pretty well, but not in the area where it
comes up (gets the most traffic). it is amazing
what you can do with a hammer and a chisel.
scraped the whole area clean down to previous
concrete slab and then i made sure the area was
roughed up by grinding it a bit with a coarse
stone. the stone really didn't seem to do much
but i figured it was better than nothing.
swept off the dust, rinsed it off and then put
down the new mix.

finished up just in time for a rain storm
so damp cure is not a problem. after it passed
and the sun is out i've put towels over the area
and hosed 'em down. i'll do that every few hours
until i go to sleep tonight.

my previous efforts were all done in the fall
when the temperatures weren't the best too, so
i'm sure that didn't help.


songbird