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Early C19 Damp Grade II listed bungalow

Postby tvrulesme » Wed Sep 22, 2021 7:27 am

I am in the process of buying a Grade II listed bungalow which has been vacant for the last 4 years. The Building Survey RICS Level 2 (Structural Survey) has unsurprisingly high-lit some damp issues.
    To the sitting room wall with rising and penetrating damp to either side of the French doors opening out to the garden.
    There is further dampness evident to the sitting room to either side of the chimney breast and the chimney breast itself.
    Dampness was evident to the chimney stack in the dining room and also to the walls to the bay window sections.
    There is excessive dampness to all walls including penetrating damp to the bedroom.
    Penetrating damp and rising damp was evident to the walls adjacent the opening to the bathroom and also the wall adjoining the bedroom/study area.
    Further dampness to the bedroom/study extension to either side of the French doors at high and low level with excessive penetrating damp and rising damp to the corner of the wall adjacent the kitchen.
The loft area seems to be fine.

Our mortgage company has requested a Timber and Damp survey from a PCA member which is scheduled to be conducted today. My plan is to carry out any remedial and monitoring work suggested in the report but as this will be a holiday home for my family which will be vacant most week days and used by us over weekends I was wondering how best to tackle ventilation and/or dehumidification as well as drying out the existing damage.

My initial thought is to install a desiccant dehumidifier like the Ecor pro DH1200 DryFan 12L Desiccant Dehumidifier in the roof area.
https://ecor-pro.com/product/dh1200-dryfan-12-litre-desiccant-dehumidifier/
Given this is a listed building I will need to retain the original fabric of the building wherever possible but I do have a number of existing vents or openings to the outside which could be repurposed.

Can anyone tell me if this is an awful idea, if a ventilation system would be better or if I should be thinking of something else entirely?

I have attached a floor plan with as many details as I think would be relevant to help.

Totally understand that the topic of rising damp is highly controversial so if you could please play nicely in your replies that would be fab ;)
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Screenshot 2021-09-22 at 08.17.56.png
Floor area and vents etc to outside
tvrulesme
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Postby stoneyboy » Thu Sep 23, 2021 8:34 pm

Hi tvrulesme
Suggest you reduce the high ground levels to 150mm below DPC level shown in purple on your plan.
Then instal a proper de-humidifier with a permanent drain connection to outside.
Leave things to settle down and damp levels to stabilise.
Regards S
stoneyboy
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