Per molt que esperem, muntarem la mosquitera avui.

Per molt que is a concessive expression. It means something like:

• no matter how much
• however much
• and in this context, more naturally, no matter how long

So Per molt que esperem means No matter how long we wait. It introduces an idea that does not change the result in the main clause.

Yes, this kind of clause normally takes the subjunctive in Catalan.

The tricky part is that with esperar, the 1st person plural present subjunctive is esperem, and the 1st person plural present indicative is also esperem. So the form looks the same, but in this sentence it is understood as subjunctive because of the structure per molt que + verb.

So grammatically, the sentence is functioning like:

• Per molt que esperem = No matter how long we may wait

Because avui tells you which day, while muntarem tells you the action is still in the future from the speaker’s point of view.

So the idea is:

• today = the action happens sometime today
• we will install/put up = it has not happened yet

This is very similar to English:

• We’ll do it today

So there is no conflict between muntarem and avui.

Here muntar means something like:

• to put up
• to set up
• to assemble
• to install

With mosquitera, the best English translation depends on the object:

• if it is a bed net, put up the mosquito net
• if it is a window screen, install the mosquito screen

So muntarem la mosquitera means that they are going to physically set it up or install it.

Mosquitera is the thing used to keep mosquitoes out. Depending on context, it can mean:

• mosquito net
• mosquito screen

So the exact English word depends on what kind of object the speaker is talking about:

• around a bed → mosquito net
• on a window or door → screen

Because mosquitera is a feminine singular noun, so it takes la.

Also, Catalan often uses the definite article in places where English may or may not use the, depending on context. Here la mosquitera most naturally suggests the mosquito net/screen that both speaker and listener already know about.

So this is completely normal Catalan.

The word order is fairly flexible.

This sentence is fine:

• Per molt que esperem, muntarem la mosquitera avui.

But you could also say:

• Per molt que esperem, avui muntarem la mosquitera.
• Avui muntarem la mosquitera, per molt que esperem.

The original version puts avui at the end, which can give it a bit of emphasis. The basic meaning stays the same.

Not exactly.

• encara que usually means although or even if
• per molt que emphasizes degree and often means no matter how much / however much / however hard / however long

So:

• Encara que esperem = Even if we wait / Although we wait
• Per molt que esperem = No matter how long we wait

In your sentence, per molt que is stronger and more specific. It stresses that the amount of waiting will not change the fact that they will install the mosquito net today.

Yes, it is grammatical and understandable.

It suggests something like:

• waiting longer will not change the decision
• despite the delay or hesitation, they are still going to do it today

So the overall idea is:

• No matter how long we wait, we’re putting up the mosquito net today.

It may sound a little more natural in some contexts if you add a word like igualment for extra emphasis, but the original sentence is perfectly valid Catalan.

Because Per molt que esperem is an introductory subordinate clause. In writing, it is normal to separate that kind of clause from the main clause with a comma.

So the structure is:

• subordinate clause: Per molt que esperem
• main clause: muntarem la mosquitera avui

This punctuation helps make the sentence easier to read.