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Do I need vapor barrier in unheated garage?

The majority seem to agree that insulated, unheated garages, should be allowed to breathe. If the garage is heated, you will need a vapor barrier, otherwise you will get frost and mold.

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Unfortunately, there is no simple answer to this, and researching through blog posts, forum discussions and YouTube videos will inevitably result in lots of contradictory statements and claims. Below we will briefly discuss the science behind using vapor barriers, before making some recommendations (all of which come with important qualifiers). Vapor moves from high humidity to low humidity, which means that it will move from a warm area to a cold area. An insulated garage is usually warmer than the outside and the vapor will therefore try to move through the wall materials and escape the garage. It will diffuse through the drywall, insulation and then the sheetrock. Some people refer to this as allowing the garage to breathe. Now we will discuss some of the contradictory claims. Some argue that installing a vapor barrier will trap this vapor in the garage and result in damp and mold, and therefore it should not be installed, especially in the southern states which have warm climates and are therefore likely to see a lot of vapor movement from inside the garage to the outside. It is argued that it should just be allowed to travel out through the wall materials. The majority seem to agree that insulated, unheated garages, should be allowed to breathe. If the garage is heated, you will need a vapor barrier, otherwise you will get frost and mold. Some argue that the car itself will cause the garage to be heated, but this would only be the case if you left the car to warm up in the morning, otherwise it would not have the chance to warm the garage. Others argue that a vapor barrier is required to meet building code. For this, I would check your local regulations as they vary from state to state. We hope this helps, but if unsure, contact a reputable contractor for their advice.

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Do I need planning permission to attach my garage to my house?

Planning permission is not usually required, providing the work is internal and does not involve enlarging the building. If your intention is to convert a garage into a separate house (regardless of who will occupy it), then planning permission may be required no matter what work is involved.

Planning permission is not usually required, providing the work is internal and does not involve enlarging the building. If your intention is to convert a garage into a separate house (regardless of who will occupy it), then planning permission may be required no matter what work is involved. We advise that you discuss such proposals with your Local Planning Authority to ensure that any work you do is lawful and correctly permissioned.

Find your Local Planning Authority ( https://www.planningportal.co.uk/find-your-local-planning-authority )

Find your Local Planning Authority

Sometimes permitted development rights have been removed from some properties with regard to garage conversions and therefore you should contact your local planning authority before proceeding, particularly if you live on a new housing development or in a conservation area. Where work is proposed to a listed building, listed building consent may be required. Please note: The permitted development allowances described here apply to houses and not to:

Flats and maisonettes (view our guidance on flats and maisonettes )

Converted houses or houses created through the ‘permitted development’ rights for: ‘Changes of use’ (Schedule 2, Part 3, Classes G; M; MA; N; P; PA and Q) (as detailed in our change of use section ) ‘New Dwellinghouses’ (Schedule 2, Part 20)

Other buildings

Areas where there may be a planning condition, Article 4 Direction or other restriction that limits permitted development rights. Build Aviator's estimating service can help you plan your project by providing an accurate cost of the proposed changes. Find out more . A planning consultant may help with the smooth running of your garage conversion project. To find an accurate consultancy quote, explore Studio Charrette's calculators .

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