Mantolama tadilat sırasında yapılacak.

In everyday construction Turkish, mantolama usually means thermal insulation work, especially exterior wall insulation / cladding on a building.

Grammatically, it is a noun, not a finite verb here. It names the job or process itself.

So in this sentence, mantolama is the thing that will be done.

Sırasında means during or in the course of.

It comes from:

• sıra = order / sequence / turn
• sırasında = during it / in its course

In tadilat sırasında, the full sense is during the renovation.

This structure is very common in Turkish:

• ders sırasında = during class
• toplantı sırasında = during the meeting
• yolculuk sırasında = during the journey

So tadilat sırasında works as a time expression.

Because Turkish often forms this kind of phrase by putting two nouns together, where the second word carries the key ending.

So instead of something more literal like renovation’s during, Turkish uses the fixed pattern:

• X sırasında = during X

Examples:

• ameliyat sırasında = during the operation
• yemek sırasında = during the meal
• tadilat sırasında = during the renovation

You do not need to add another case ending to tadilat here.

Yapılacak comes from the verb yapmak (to do / to make) and contains:

• yap- = do / make
• -ıl- = passive marker
• -acak = future tense

So:

• yapacak = will do
• yapılacak = will be done

That is why the sentence has a passive meaning.

Yes. In this sentence, yapılacak is passive.

The passive marker is -ıl-. Because of that, the sentence means that the work will be carried out, not that someone will do it.

Compare:

• Usta mantolama yapacak. = The worker will do the insulation.
• Mantolama yapılacak. = The insulation will be done.

Turkish often uses the passive when the person doing the action is unknown, unimportant, or simply not mentioned.

Because in the 3rd person singular future, Turkish often uses the plain future form without an extra personal ending.

So:

• yapacağım = I will do
• yapacaksın = you will do
• yapacak = he/she/it will do

And in the passive:

• yapılacağım would not make sense in normal usage here
• yapılacak = it will be done

Since mantolama is singular, yapılacak matches it naturally.

This is a very normal Turkish word order.

A simple way to see it is:

• Mantolama = subject/topic
• tadilat sırasında = time expression
• yapılacak = verb

Turkish often puts the verb at the end. Time expressions usually come before the verb.

So the structure is very natural: [what] + [when] + [verb]

You could move parts around for emphasis, but the final verb position is the most standard:

• Mantolama tadilat sırasında yapılacak.
• Tadilat sırasında mantolama yapılacak.

Both are possible, with slightly different focus.

Yes, yapılacak can sometimes be a future participle meaning something like that will be done or to be done, depending on context.

For example:

• yapılacak işler = the things to be done / the jobs that will be done

But in your sentence, yapılacak is at the end and functions as the main verb, so the meaning is clearly:

will be done

Turkish does not have articles like the or a/an in the same way English does.

So a noun like mantolama can mean:

• insulation
• the insulation
• insulation work

The exact sense comes from context.

Likewise, tadilat can mean:

• renovation
• the renovation
• renovation work

English usually has to choose an article, but Turkish often leaves that to context.

Yes. The future suffix -acak / -ecek often covers both ideas:

• will be done
• is going to be done

The difference usually depends on context and tone, not on a separate form.

So yapılacak can sound like a straightforward future statement or a planned future action.

Yes. In this passive sentence, mantolama is the thing being talked about, so it behaves like the grammatical subject.

Compare:

• Active: Ekip mantolama yapacak.
  The team is the subject.

• Passive: Mantolama yapılacak.
  Mantolama becomes the subject of the passive sentence.

This is similar to English:

• The team will do the insulation.
• The insulation will be done.

Yes. Esnasında is very similar to sırasında, and both can mean during.

So these are both natural:

• Mantolama tadilat sırasında yapılacak.
• Mantolama tadilat esnasında yapılacak.

In many contexts, the difference is small. Esnasında can sound a little more formal to some speakers, but both are common and correct.