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Venting yes, insulation no. Insulation only slows heat or cold lossSorry, qtron. You really should've mentioned you were using this shed as a workshop or gainsomething & trying to cool it. IfI realize you might say "why would I have insulated it otherwise". We have no heating nor cooling in the shed thenway of knowing unless you will never have a comfortable shed & any insulation is completely pointless & actually inviting premature rotsay, mold & mildew damagewe see many weird actions taken by people. Cooling changes everything!

All sheds of this setup should only be bare-wall & ventedIn that case, for decadesyou have the foil of maintenance free existence. The reason isthe adequate insulation facing the wrong way, it's currently retaining any heat that youliterally seeps inside. You do want it facing the shedmetal to instantly change with the outdoor temperature soliterally reflect heat back out as to avoid condensation or minimizesoon as it tries to enter, that's actually the specific purpose of the shiny side.

Cardboards, interior upholstery & fabricsYou do still want some minor venting & carpeting should never be stored in a small air-space between the insulation & the shed. Many Outdoor cushions are questionable walls (just a few mm's), to let any heat out as wellquickly as possible. Venting could be a series of small holes drilled directly under any roof edge or lip that you might have & shouldwould only be washedfor venting the insulation air-down before usespace & not the entire shed's volume. Table Umbrellas are fine, but shouldYou may also have a roof ridge cap where the same could be sunbathed annuallydone. If these areas or opportunities don't exist then you'll need to attach a roof vent box & wall grills.

As well, do definitely fill or cover that door gap, even with just a sweep type strip will make a big difference. Please explain the cooling unit if it's not a rolling portable or standard window type unit that's dumping heat & humidity directly to the outside & bringing in fresh air during the cooling process.

Venting yes, insulation no. Insulation only slows heat or cold loss or gain. If you have no heating nor cooling in the shed then you will never have a comfortable shed & any insulation is completely pointless & actually inviting premature rot, mold & mildew damage.

All sheds of this setup should only be bare-wall & vented, for decades of maintenance free existence. The reason is that you want the shed to instantly change with the outdoor temperature so as to avoid condensation or minimize it.

Cardboards, interior upholstery & fabrics & carpeting should never be stored in a shed. Many Outdoor cushions are questionable as well & should be washed-down before use. Table Umbrellas are fine, but should be sunbathed annually.

Sorry, qtron. You really should've mentioned you were using this shed as a workshop or something & trying to cool it. I realize you might say "why would I have insulated it otherwise". We have no way of knowing unless you say, we see many weird actions taken by people. Cooling changes everything!

In that case, you have the foil of the adequate insulation facing the wrong way, it's currently retaining any heat that literally seeps inside. You do want it facing the metal to literally reflect heat back out as soon as it tries to enter, that's actually the specific purpose of the shiny side.

You do still want some minor venting & a small air-space between the insulation & the shed walls (just a few mm's), to let any heat out as quickly as possible. Venting could be a series of small holes drilled directly under any roof edge or lip that you might have & would only be for venting the insulation air-space & not the entire shed's volume. You may also have a roof ridge cap where the same could be done. If these areas or opportunities don't exist then you'll need to attach a roof vent box & wall grills.

As well, do definitely fill or cover that door gap, even with just a sweep type strip will make a big difference. Please explain the cooling unit if it's not a rolling portable or standard window type unit that's dumping heat & humidity directly to the outside & bringing in fresh air during the cooling process.

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Venting yes, insulation no. Insulation only slows heat or cold loss or gain. If you have no heating nor cooling in the shed then you will never have a comfortable shed & any insulation is completely pointless & actually inviting premature rot, mold & mildew damage.

All sheds of this setup should only be bare-wall & vented, for decades of maintenance free existence. The reason is that you want the shed to instantly change with the outdoor temperature so as to avoid condensation or minimize it.

Cardboards, interior upholstery & fabrics & carpeting should never be stored in a shed. Many Outdoor cushions are questionable as well & should be washed-down before use. Table Umbrellas are fine, but should be sunbathed annually.