2. While making sure there is no pilot or embers active in the fireplace, a temporary drape of plastic sheeting can be taped over the fireplace opening. If you do decide to seal around the door, clean the surfaces of loose rust and dirt. Instead, hire a professional to take care of it. Water and moisture can cause scaling, deterioration, spalling, water intrusion in the home, and freeze/thaw damage. As mentioned in the case of concrete block chimneys, stucco plaster is in itself a good waterproofing material. You will also have to tape around all the flue liners, once again about half an inch from the crown. Anyway, sealing and capping by a Mason or some Chimney Sweeps who also do minor repairs - probably about $100-250 for the sealing depending on whether just the above-roof part or entire chimney exterior surface to the ground, capping (just taking off the chimney cap and screening and replacing with a domed sheet metal cap) usually about $100 on same trip. That is why the disposable glove was mentioned as one of the required tools. But the size of the pores in a concrete block chimney is much bigger, so ideally you should completely seal these pores. However, this will not increase the prices you pay for products. You have to start from the bottom and spray the sealant on the bricks evenly. Soak the surface well to ensure complete saturation. If you spot them early, the repairs may cost you anywhere from $500 to $1000. Through these gaps, if left unsealed, combustion gases may leak into your home and build up to unhealthy levels. Once the entire chimney is sealed, allow the proper drying time as directed by the manufacturer. Before applying the new sealant to fix the leak in your brick chimney, you'll need to scrape out the previous sealant using a scraper. One end of the chimney pipe will be crimped and this is where you’ll slide the stove pipe over, pressing them together firmly. SuperSeal 30 Gloss Also, this sealant has a relatively low degree of volatility and high value for money, as it provides high-quality protection from moisture at a comparatively low cost. In this case, it specifically protects the chimney flue and helps it last longer. Make sure whatever you’re using for cutting the aluminum can produce a finish edge. Let the sealant dry after application, and unless you purchased a sealant meant for wet weather, avoid getting it wet during the … eval(ez_write_tag([[300,250],'sealwithease_com-large-mobile-banner-1','ezslot_6',190,'0','0'])); Also, the chimney crown might not be easily accessible from the roof either. If you do decide to go ahead and do it yourself, then make sure that you have a high-quality roof harness to provide you with extra protection. 1. If the chimney and fireplace are solid masonry, the usual procedure to seal the joint is to bed a trim board in a good elastomeric caulk against the brick and the sheathing. In severe cases, chimney caps have to be repaired or replaced, or the chimney may need to be repointed. The chimney should be clean and free of dirt, oil, dust and any unwanted contaminants. Before sealing a brick chimney, clean the surface with a brick cleaner to remove all curing compounds or visible stains such as mold, mildew, efflorescence, or rust. If you want to seal your fireplace off for good, the easiest way to do so in a hurry is to cut out a foam insulation plug, place it at the bottom of your chimney, and caulk or weatherstrip it in place. Chimneys with stucco plastering are probably the trickiest in terms of waterproofing or sealing. When using a sprayer, follow up with a brush or roller to even out the sealer and reduce excess that may cause runs and drips. This periodic expansion and contraction lead to the formation of cracks, which deteriorate with time. Use a scrub brush or pressure washer to wash the brick thoroughly, starting at the top and working down. Apply sealant to the flashing of your brick chimney using a caulking gun. Chimney liners or flues, are designed to carry the products of combustion from fires safely out of the home. Allow the cleaner to dwell for a few minutes on the surface. Now, pour the water-repellent sealer into the low-pressure sprayer and spray it evenly all over the chimney. Most homeowners are guilty of neglecting the chimney till it is too late or some serious damage has already occurred. Apply the cleaning solution with a brush, garden sprayer, or pressure washer. 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