Stove backdraught.

Rougebladez

Got a stove installed by a builder in an extension last April and didn't use it till Nov due to the very good weather last year. We installed one in the main fireplace years ago and have had no problems with it.

Problem is that we have a backdraught problem. We can light it with kindling to get a good up draught and then add the logs and we get a small bit but it's manageable, however It became really obvious last night with the storm. The smoke was pouring into the room. So much so that I had to remove the majority of fuel and leave it go out itself.

The top is about 16 inches above the lowest tile and it has a witches hat on top which I thought would be enough. Have been looking online for a solution which seems to be a flue top to reduce the backdraught. Would a H cowl work better? Has anyone any ideas or had the same experience?

Robbie.G

Rougebladez wrote: »

Got a stove installed by a builder in an extension last April and didn't use it till Nov due to the very good weather last year. We installed one in the main fireplace years ago and have had no problems with it.

Problem is that we have a backdraught problem. We can light it with kindling to get a good up draught and then add the logs and we get a small bit but it's manageable, however It became really obvious last night with the storm. The smoke was pouring into the room. So much so that I had to remove the majority of fuel and leave it go out itself.

The top is about 16 inches above the lowest tile and it has a witches hat on top which I thought would be enough. Have been looking online for a solution which seems to be a flue top to reduce the backdraught. Would a H cowl work better? Has anyone any ideas or had the same experience?

What way is the flue done.
Is the flue coming off the top or back of stove.
What way does it come out through the wall
Is it a single or two storey house.
Where does the flue terminate
What size is flue
These are the questions that need to be answered.
Pictures speak better than words if you can post a few pics it will help
Generally the flue should terminate above the ridge and be a min of 5.5 mtrs high

Calahonda52

... and
what height is extension relative to house.


have a look at Part J in the Tech guidance docs in environ dot ie

H cowl not the best choice in my view
have a look at topcap dot ie

Rougebladez

Top flue. 1.5m to 90 deg wall exit. Another90 deg to vertical outside. 2m to 45deg. Another1m to another 45deg to vertical and finishes about 16 inch above lowest tile on extension.

I'll try and post a pic on Sat.
The top cap site was the one I was looking at Calahonda.

Ext is about 1 to 1.5m lower that main apex.

Calahonda52

Read Part J re bends,
How do u clean it?

Topcap dont recommend H for downdraught

Rougebladez

It has access at the 90deg on outside. I'll have to get a flexisweep to get past the 45s.

Robbie.G

Rougebladez wrote: »

It has access at the 90deg on outside. I'll have to get a flexisweep to get past the 45s.

90deg bends are not permitted on solid fuel and no horizontal pipe longer than 150mm

Rougebladez

The top cap recommends the anti down draught cowl but then it says "The H Cowl is the ultimate protection for downdraght and blow backs."

Wish they'd make up their minds.

Robbie.G

Rougebladez wrote: »

The top cap recommends the anti down draught cowl but then it says "The H Cowl is the ultimate protection for downdraght and blow backs."

Wish they'd make up their minds.

The h cowl is the best there is but it is also the one that's going to kill you first.
That's because you can't sweep a h cowl without removing it

JCCA

Hello, we live in a bungalow, (small housing estate) 22 years old with one fireplace (no back boiler) in the living room, with consistent problems with downdraft of smoke billowing into the living room if the wind is blowing the wrong direction. There is no air vent in the room however we have tried having a large window open to try to prevent the downdraft issue, to no avail. We have been told by a reputable chimney sweep that our chimney is too short!! We have been recommended by a couple of different sources to fit an oh cowl, a fire door, inset stove, combination of cowl and door etc. Would welcome any advice please.