Knowledge Builders

should a blocked up fireplace be vented

by Diana Keeling Published 10 months ago Updated 1 month ago
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A chimney needs a vent, not just at the top (provided by the cap) but also at the bottom. When you brick up the fireplace you need to fit either an air brick or a plastic/metal vent to allow air flow through the stack. The air flow helps keep the chimney dry and ward off any condensation forming inside the stack.

Ventilation needs to be provided to the chimney space to avoid moisture collecting on the soot and smoke deposits within the chimney and forming damp areas, this can easily be achieved by building in an air-brick as the fireplace opening is bricked up.

Full Answer

Do you need a vent for a vented fireplace?

In most cases, if you don’t already have a chimney, you have to create a “vent” for the vented fireplace. That means creating a hole in your roof for a chimney or your wall for a wall vent. Of course it is not as simple as it sounds.

Can a chimney be blocked up without venting?

Having said that, my chimneys are blocked up without venting !!! ideally fit a airbrick at the top and bottom to allow through venting, if you remove and cap the top fit a airbrick to allow ventilation to chimney (You must log in or sign up to reply here.)

How do I block up an unused fireplace?

Blocking up an unused fireplace. Ventilation needs to be provided to the chimney space to avoid moisture collecting on the soot and smoke deposits within the chimney and forming damp areas, this can easily be achieved by building in an air-brick as the fireplace opening is bricked up. It is also necessary to cap the chimney pot to allow air...

Are Ventless Fireplaces safe?

Before you consider whether or not ventless fireplaces are safe, it is important to note that all gas fireplaces could potentially leak carbon monoxide into your home. Blocked chimneys, cracked glass panes, old parts or leaking gas lines can all be responsible for gas leaks from vented gas fireplaces.

Why vent lower down in chimney?

Do you have to vent a chimney breast?

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Does a blocked fireplace need a vent?

Yes, chimneys need to breathe, even if they won't be used anymore. The vast majority of problems with chimneys are related to moisture, and that's the issue as regards ventilation. If there is no air flow in the chimney, moisture gets trapped and deterioration of the chimney structure will be accelerated.

What to put in a blocked up fireplace?

You can fill in the fireplace with thermalite blocks and bricks and then plaster over. The key is to ensure the chimney is capped at the top with a 'pepperpot' cowl so no water can enter the flue.

How do you unblock a blocked fireplace?

If the fireplace has been filled in with bricks, start from the vent and slowly knock out a few at a time with a club hammer and bolster chisel. You may find it easier to remove the plaster from the area first and then chip out the bricks, one by one, once you can see where the mortar joints are.

How do you ventilate a disused chimney?

You should cap any unused chimneys with a flue ventilator. Flue ventilators can be found on our chimney pot page. The flue ventilator stops rain entry to the chimney but still allows a small amount of air passage for ventilation.

What do you do when your fireplace is closed?

No Heat Required. ... Fill It With Fire-Ready Logs Anyway. ... Embrace a More Organic Design. ... Fake Stacked Logs With a DIY Summer Front. ... Place Tiered Candles Inside. ... Cover It With an Ornate Fire Screen. ... Use It as a Shadow Box to Display a Favorite Object. ... Handsome Firebox.More items...

How much does it cost to unseal a fireplace?

Chimney and Fireplace Removal CostsNational Average Cost$4,500Minimum Cost$500Maximum Cost$10,000Average Range$3,000 to $6,000

How do you tell if your flue is blocked?

The Symptoms of a Blocked Flue Liner An excessive smell of smoke during a fire. A white residue on the walls of the flue liner. Water leakage. Debris falling towards the base of the fireplace.

Can blocked chimney be unblocked?

Clearing out a blocked chimney can be very expensive, especially if the sweep charges per hour and takes a long time to remove compact debris. The best way to avoid a blocked chimney is to install a chimney cap. This cap will prevent animals of all shapes and sizes from bringing any nesting material into your flue.

What causes a chimney to be blocked?

Sometimes these obstructions are caused by physical factors such as motor deposits, birds nests or collapsed flues. In other cases the obstruction can be caused by poor chimney design such as insufficient height, nearby trees or negative air pressure due to the house being airtight.

Can a blocked chimney cause damp?

We often get asked 'can a blocked chimney cause damp'? The answer is yes, especially if there is little or no ventilation.

How much heat is lost up a chimney?

Putting a Damper on Your Energy Bills What's more, between 80 and 90 percent of the heat produced by wood burned in an open fireplace is lost up the chimney. This means that for every $100 you spend on firewood, you get only $10 to $20 worth of heat.

How do you vent a fireplace?

Venting can be as easy as running pipe from the back of the fireplace out through the wall, then installing a termination cap. “If I put an appliance on my exterior wall, I can go right off the back, basically put a cap on and not have to worry about extensive venting going up in the roof,” Hendrickson says.

Can I put a pillow up my chimney?

Although it's cheap, the pillow is prone to sucking up moisture, causing mold and blocking the chimney from breathing. It also has nothing to remind anyone lighting a fire that it's there, and has passed no fire safety tests. This is definitely not an option you want to explore.

What do you put on chimney breast walls?

Consider decorating your non-active chimney breast by installing a mantelpiece (if you don't already have one), putting flowers, logs, ornaments, books, bunting or even artwork in the hearth.

Are chimney balloons any good?

The plastic Chimney Balloons can be blown up manually and are inserted into the throat of the chimney. However, while they were easy to use, these widely-used inflatables don't actually perform well in preventing air leaks and helping you maximise your home heating and cooling!

What can you put in front of a fireplace?

Pumpkins, acorns, and branches of fall leaves bring the natural elements forward. Warm colors easily stand beside neutral palettes. Garlands of berries, burlap, and cranberries festoon the mantle. Add baskets and chairs to the fireplace front to complete your home's fireplace display.

Do I still need an air vent in my sealed-up fireplace?

I'm bricking up an unused fireplace in a house about 30 years old. It had an open flame gas fire in it previously (with a nasty brick fireplace!). It's worth noting that although the chimney stack was originally outside, there has subsequently been an extension built on the far side, so the stack is now internal for most of the way up until about 2/3rd of the way up the second storey.

Do I need an air vent for my sealed-up fireplace? - Alarms4Life

In conclusion, sealing up your fireplace will come with a lot of challenges. This should not stop you from moving to a more sustainable way of warming up your house. Climate change is a severe problem and if you intend to move to more greenhouse ways, then thumbs up to you. It would be wise to put an air vent somewhere along the line.

Is it REALLY necessary to have an airbrick when blocking up a fireplace ...

We will be removing an old gas fire (disconnected) in a 1960s house and want to block up and plaster over the fireplace to have a completely flat wall. I see plenty of these on house renovation programmes where they've inserted an airbrick where the fireplace used to be, but if we can avoid it, I'd really like to do so as I don't like the way these look.

How should we block up an old fireplace? - MyBuilder

We have discovered an old fireplace in a bedroom. We do not want to restore it and would like to block it up and plaster the chimney breast, so we can put furniture in front of it. laura_statton 2011-11-18T10:52:33+00:00

DIY advice for how to block up fireplaces | eHow UK

Lay the brick on the floor of the fireplace, flush with the front of the fireplace. Press it down so the cement oozes out just a bit under the brick. Wipe away the excess and repeat with another brick. Apply cement in between each brick in the same way; the bricks should be flush against each other, except for the thin layer of cement.

Is it necessary to have an air brick when blocking up a fireplace?

If you had a chimney, then the moisture absorbed will be different from normal once you seal the chimney.

What happens if you seal a fireplace without an outlet?

The chimney is one of the main structural foundation points and if this collapsed the house may. This is one of the main dangers that you can expect if you seal your fireplace without an outlet for moisture.

Why put an air vent on a house?

It would be wise to put an air vent somewhere along the line. Doing this will prevent a buildup of moisture and protect your house’s structure. Doing this is quite simple; all you will need is an air brick.

What happens when you close a fireplace?

When you close this and allow this space to become infiltrated by both hot and cold, it will be a damp space. You will need to understand that there is no place for the moisture to go.

What is an airing brick?

Some bricks come with holes in them that can feature many different patterns and shapes. This is what’s referred to as an airing brick.

Why do people close their fireplaces?

Most people are doing this because of the boom in what’s known as internal heating features.

Do you have to buy a ventilation panel?

You have to buy a ventilation panel with a specific mechanism to ventilate chimneys. This is a more high-class option, but, they perform the same task.

What is the Difference Between Vented and Ventless Fireplaces?

There are a few key differences between vented fireplaces and ventless fireplaces. The first difference has to do with functionality, the second has to do with aesthetics, and the third has to do with preference:

Are Ventless Fireplaces Safe?

Before you consider whether or not ventless fireplaces are safe, it is important to note that all gas fireplaces could potentially leak carbon monoxide into your home. Blocked chimneys, cracked glass panes, old parts or leaking gas lines can all be responsible for gas leaks from vented gas fireplaces.

Vented Vs. Ventless Fireplaces: Pros and Cons

To make the two types of gas fireplaces a little easier to compare, below is a table with some pertinent facts set side by side. Here is a quick look at a vented vs. ventless fireplace stand up against each other. You may be surprised at the benefits and drawbacks of each:

Which is Better–Direct Vent or Ventless Gas Fireplaces?

As with so many things, when answering which item is better than the other, you have to know as much about what you want as about the differences between the two items. As much is true of vented versus ventless gas fireplaces. The big question to answer is if you are comfortable with ventless.

How to Know if Your Fireplace is Vented or Ventless

You should be told at the time of purchase whether your fireplace is vented or ventless. Because ventless fireplaces are banned in some areas, the distinction should be made very clear. But maybe you have bought a home that has a gas fireplace and you do not really know for sure whether it is vented or ventless.

Can a Ventless Gas Fireplace be Converted to Vented?

If you have a ventless gas fireplace and you either regret buying it or you regret that it was in the home that you bought, you may be wondering if you can convert it to a vented fireplace. It sounds like a reasonable enough idea. It’s a fireplace, just cut a hole in the top, attach a pipe, and stick it through the roof, right?

Conclusion

If the decision is yours to make, then both vented and ventless gas fireplaces are viable options for your home. Keep the controversies surrounding the ventless fireplaces in context. They are best used when used wisely and within the precautions that the manufacturers suggest. Do so and they may be a good source of heat for your home.

What is the final job on a chimney?

The final job is to fit the ventilation cowl to the chimney pot - this is probably the worst part of the job especially if you don’t like heights. Do not take any chances when working on the roof, it may appear to be only a ‘five minute job’ but you need to gain safe access to the chimney stack and then reach the top of the chimney pot. Your may feel better if you let a professional roofer do the job even if you have to pay him. Whatever you do, work safe and don’t take chances.

What is required to suit a chimney pot?

A ventilation cowl is required to suit the chimney pot.

Why do you need to cap a chimney?

It is also necessary to cap the chimney pot to allow air circulation through the chimney while keeping rain, birds etc out. The easiest way to cap a chimney is to fit an appropriate ventilating cowl to the top of the chimney pot.

Where to put air brick in brickwork?

Fit the airbrick in the middle of about the third row of new brickwork – the exact position is not important; it need to be fairly low but must not be at the extreme bottom and needs to clear any skirting board being used. The airbrick needs to project forward of the rest of the brickwork so that its front face (with the holes in) is flush with the original plaster on each side – use a straightedge across the front to achieve this.

When to rake out mortar joints?

When the brickwork is complete, “rake” out the mortar joints to give a good key for the plastering to follow.

Can you fix skirting on chimney breast?

After the plastering has been completed, you can fix a new piece of skirting across the bottom of the chimney breast – rather than just fitting a new piece across where the hearth was, it usually give a better finish if the short lengths of original skirting either side of the hearth are removed back to the corner and a new piece fitted across the complete front of the chimney breast.

Do you need to cover bricks with plaster?

A quantity of plaster will be required to cover the face of the bricks – this can only be applied once the mortar holding the bricks has gone off. A new section of skirting board will be required to finish off the wall after the plaster has gone off. A ventilation cowl is required to suit the chimney pot.

How to stop damp patches from forming?

To stop damp patches forming one is encouraged to fit an air brick.

Is a single leaf chimney breast the same as the rest of the house?

If you have a cavity wall home with no insulation, then a single leaf chimney breast is just the same as the rest of the home . (an express route for your heat to escape to the outside.)

Why vent lower down in chimney?

wrong. you need to vent lower down in the chimney to stop condensation in the chimney breast... why this is a problem?? well, the damp could penetrate the wall and spoil decorative finishes, but also can react with the chemicals in old soot and attack the brickwork.

Do you have to vent a chimney breast?

I always thought you had to vent a chimney breast if the pot was left open, possibly from rainfall. If you seal ed the pot there was no need to vent.

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Is It Necessary to Have An Air Brick When Blocking Up A fireplace?

Does It Cost A Lot to Put A Vent Panel Into A Bricked-Up fireplace?

  • In some cases, we could say that it is expensive to put a vent panel into a sealed-up fireplace. This depends on the kind of house that you have. If you have got an average-sized modern house, then this procedure will not be very expensive. You will only need in most cases to seal up the bottom side of the fireplace. If you do this well enough, the...
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Questions and Topics

  • How an unvented fireplace can encourage damp, i.e., no draught. When you have a space such as a fireplace that has been open and experienced a whole array of gas passes through. When you close this and allow this space to become infiltrated by both hot and cold, it will be a damp space. You will need to understand that there is no place for the moisture to go. It will then begin to star…
See more on alarms4life.com

Conclusion

  • In conclusion, sealing up your fireplace will come with a lot of challenges. This should not stop you from moving to a more sustainable way of warming up your house. Climate change is a severe problem and if you intend to move to more greenhouse ways, then thumbs up to you. It would be wise to put an air vent somewhere along the line. Doing this will prevent a buildup of m…
See more on alarms4life.com

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